From e47d6e4f25a36af2233c26beb0f6caf78203406f Mon Sep 17 00:00:00 2001
From: Om-A-osc <omanand8132@gmail.com>
Date: Sat, 11 Apr 2026 15:06:15 +0530
Subject: [PATCH 1/2] refactor(stats/base/dists): reuse variance implementation
 for stdev

---
type: pre_commit_static_analysis_report
description: Results of running static analysis checks when committing changes.
report:
  - task: lint_filenames
    status: passed
  - task: lint_editorconfig
    status: passed
  - task: lint_markdown
    status: na
  - task: lint_package_json
    status: na
  - task: lint_repl_help
    status: na
  - task: lint_javascript_src
    status: passed
  - task: lint_javascript_cli
    status: na
  - task: lint_javascript_examples
    status: na
  - task: lint_javascript_tests
    status: na
  - task: lint_javascript_benchmarks
    status: na
  - task: lint_python
    status: na
  - task: lint_r
    status: na
  - task: lint_c_src
    status: passed
  - task: lint_c_examples
    status: na
  - task: lint_c_benchmarks
    status: na
  - task: lint_c_tests_fixtures
    status: na
  - task: lint_shell
    status: na
  - task: lint_typescript_declarations
    status: passed
  - task: lint_typescript_tests
    status: na
  - task: lint_license_headers
    status: passed
---
---
 .../base/dists/bradford/stdev/lib/main.js     | 10 ++--------
 .../base/dists/bradford/stdev/manifest.json   | 13 +++++--------
 .../base/dists/bradford/stdev/src/main.c      | 10 ++--------
 .../base/dists/chisquare/stdev/lib/main.js    |  7 ++-----
 .../base/dists/chisquare/stdev/manifest.json  | 10 +++++-----
 .../base/dists/chisquare/stdev/src/main.c     |  7 ++-----
 .../dists/hypergeometric/stdev/lib/main.js    | 16 ++--------------
 .../dists/hypergeometric/stdev/manifest.json  |  5 ++++-
 .../dists/hypergeometric/stdev/src/main.c     | 12 ++----------
 .../base/dists/kumaraswamy/stdev/lib/main.js  | 17 ++---------------
 .../dists/kumaraswamy/stdev/manifest.json     | 13 +++++--------
 .../base/dists/kumaraswamy/stdev/src/main.c   | 18 ++----------------
 .../base/dists/lognormal/stdev/lib/main.js    | 14 ++------------
 .../base/dists/lognormal/stdev/manifest.json  | 15 ++++++---------
 .../base/dists/lognormal/stdev/src/main.c     | 14 ++------------
 .../base/dists/pareto-type1/stdev/lib/main.js | 19 ++-----------------
 .../dists/pareto-type1/stdev/manifest.json    | 12 +++---------
 .../base/dists/pareto-type1/stdev/src/main.c  | 19 ++-----------------
 .../base/dists/poisson/stdev/lib/main.js      |  7 ++-----
 .../base/dists/poisson/stdev/manifest.json    | 12 ++++++------
 .../stats/base/dists/poisson/stdev/src/main.c | 10 ++--------
 .../stats/base/dists/t/stdev/lib/main.js      | 11 ++---------
 .../stats/base/dists/t/stdev/manifest.json    |  9 +++------
 .../stats/base/dists/t/stdev/src/main.c       | 11 ++---------
 .../base/dists/triangular/stdev/lib/main.js   | 12 ++----------
 .../base/dists/triangular/stdev/manifest.json | 12 ++++++------
 .../base/dists/triangular/stdev/src/main.c    | 12 ++----------
 27 files changed, 79 insertions(+), 248 deletions(-)

diff --git a/lib/node_modules/@stdlib/stats/base/dists/bradford/stdev/lib/main.js b/lib/node_modules/@stdlib/stats/base/dists/bradford/stdev/lib/main.js
index f93643b6a1da..dc41d6f22fd1 100644
--- a/lib/node_modules/@stdlib/stats/base/dists/bradford/stdev/lib/main.js
+++ b/lib/node_modules/@stdlib/stats/base/dists/bradford/stdev/lib/main.js
@@ -20,9 +20,8 @@
 
 // MODULES //
 
-var isnan = require( '@stdlib/math/base/assert/is-nan' );
-var ln = require( '@stdlib/math/base/special/ln' );
 var sqrt = require( '@stdlib/math/base/special/sqrt' );
+var variance = require( '@stdlib/stats/base/dists/bradford/variance' );
 
 
 // MAIN //
@@ -58,12 +57,7 @@ var sqrt = require( '@stdlib/math/base/special/sqrt' );
 * // returns NaN
 */
 function stdev( c ) {
-	var k;
-	if ( isnan( c ) || c <= 0.0 ) {
-		return NaN;
-	}
-	k = ln( 1.0 + c );
-	return sqrt( ( ( ( 2.0+c ) * k ) - ( 2.0*c ) ) / ( 2.0*c*k*k ) );
+	return sqrt( variance( c ) );
 }
 
 
diff --git a/lib/node_modules/@stdlib/stats/base/dists/bradford/stdev/manifest.json b/lib/node_modules/@stdlib/stats/base/dists/bradford/stdev/manifest.json
index 23b9fc7b9b4d..2b12b6554121 100644
--- a/lib/node_modules/@stdlib/stats/base/dists/bradford/stdev/manifest.json
+++ b/lib/node_modules/@stdlib/stats/base/dists/bradford/stdev/manifest.json
@@ -39,9 +39,8 @@
       "libpath": [],
       "dependencies": [
         "@stdlib/math/base/napi/unary",
-        "@stdlib/math/base/assert/is-nan",
-        "@stdlib/math/base/special/ln",
-        "@stdlib/math/base/special/sqrt"
+        "@stdlib/math/base/special/sqrt",
+        "@stdlib/stats/base/dists/bradford/variance"
       ]
     },
     {
@@ -56,9 +55,8 @@
       "libraries": [],
       "libpath": [],
       "dependencies": [
-        "@stdlib/math/base/assert/is-nan",
-        "@stdlib/math/base/special/ln",
         "@stdlib/math/base/special/sqrt",
+        "@stdlib/stats/base/dists/bradford/variance",
         "@stdlib/constants/float64/eps"
       ]
     },
@@ -74,9 +72,8 @@
       "libraries": [],
       "libpath": [],
       "dependencies": [
-        "@stdlib/math/base/assert/is-nan",
-        "@stdlib/math/base/special/ln",
-        "@stdlib/math/base/special/sqrt"
+        "@stdlib/math/base/special/sqrt",
+        "@stdlib/stats/base/dists/bradford/variance"
       ]
     }
   ]
diff --git a/lib/node_modules/@stdlib/stats/base/dists/bradford/stdev/src/main.c b/lib/node_modules/@stdlib/stats/base/dists/bradford/stdev/src/main.c
index 2795f6b970ec..24ccca544d85 100644
--- a/lib/node_modules/@stdlib/stats/base/dists/bradford/stdev/src/main.c
+++ b/lib/node_modules/@stdlib/stats/base/dists/bradford/stdev/src/main.c
@@ -17,9 +17,8 @@
 */
 
 #include "stdlib/stats/base/dists/bradford/stdev.h"
-#include "stdlib/math/base/assert/is_nan.h"
-#include "stdlib/math/base/special/ln.h"
 #include "stdlib/math/base/special/sqrt.h"
+#include "stdlib/stats/base/dists/bradford/variance.h"
 
 /**
 * Returns the standard deviation of a Bradford distribution.
@@ -32,10 +31,5 @@
 * // returns ~0.288
 */
 double stdlib_base_dists_bradford_stdev( const double c ) {
-	double k;
-	if ( stdlib_base_is_nan( c ) || c <= 0.0 ) {
-		return 0.0/0.0; // NaN
-	}
-	k = stdlib_base_ln( 1.0 + c );
-	return stdlib_base_sqrt( ( ( ( 2.0+c ) * k ) - ( 2.0*c ) ) / ( 2.0*c*k*k ) );
+	return stdlib_base_sqrt( stdlib_base_dists_bradford_variance( c ) );
 }
diff --git a/lib/node_modules/@stdlib/stats/base/dists/chisquare/stdev/lib/main.js b/lib/node_modules/@stdlib/stats/base/dists/chisquare/stdev/lib/main.js
index fe1780bc217b..a03578e6b2de 100644
--- a/lib/node_modules/@stdlib/stats/base/dists/chisquare/stdev/lib/main.js
+++ b/lib/node_modules/@stdlib/stats/base/dists/chisquare/stdev/lib/main.js
@@ -20,8 +20,8 @@
 
 // MODULES //
 
-var isnan = require( '@stdlib/math/base/assert/is-nan' );
 var sqrt = require( '@stdlib/math/base/special/sqrt' );
+var variance = require( '@stdlib/stats/base/dists/chisquare/variance' );
 
 
 // MAIN //
@@ -49,10 +49,7 @@ var sqrt = require( '@stdlib/math/base/special/sqrt' );
 * // returns NaN
 */
 function stdev( k ) {
-	if ( isnan( k ) || k < 0.0 ) {
-		return NaN;
-	}
-	return sqrt( 2.0 * k );
+	return sqrt( variance( k ) );
 }
 
 
diff --git a/lib/node_modules/@stdlib/stats/base/dists/chisquare/stdev/manifest.json b/lib/node_modules/@stdlib/stats/base/dists/chisquare/stdev/manifest.json
index 92e6eeaf5483..a91f57eb1f09 100644
--- a/lib/node_modules/@stdlib/stats/base/dists/chisquare/stdev/manifest.json
+++ b/lib/node_modules/@stdlib/stats/base/dists/chisquare/stdev/manifest.json
@@ -39,8 +39,8 @@
       "libpath": [],
       "dependencies": [
         "@stdlib/math/base/napi/unary",
-        "@stdlib/math/base/assert/is-nan",
-        "@stdlib/math/base/special/sqrt"
+        "@stdlib/math/base/special/sqrt",
+        "@stdlib/stats/base/dists/chisquare/variance"
       ]
     },
     {
@@ -55,8 +55,8 @@
       "libraries": [],
       "libpath": [],
       "dependencies": [
-        "@stdlib/math/base/assert/is-nan",
         "@stdlib/math/base/special/sqrt",
+        "@stdlib/stats/base/dists/chisquare/variance",
         "@stdlib/constants/float64/eps"
       ]
     },
@@ -72,8 +72,8 @@
       "libraries": [],
       "libpath": [],
       "dependencies": [
-        "@stdlib/math/base/assert/is-nan",
-        "@stdlib/math/base/special/sqrt"
+        "@stdlib/math/base/special/sqrt",
+        "@stdlib/stats/base/dists/chisquare/variance"
       ]
     }
   ]
diff --git a/lib/node_modules/@stdlib/stats/base/dists/chisquare/stdev/src/main.c b/lib/node_modules/@stdlib/stats/base/dists/chisquare/stdev/src/main.c
index bb5fee24982d..925347942f16 100644
--- a/lib/node_modules/@stdlib/stats/base/dists/chisquare/stdev/src/main.c
+++ b/lib/node_modules/@stdlib/stats/base/dists/chisquare/stdev/src/main.c
@@ -17,8 +17,8 @@
 */
 
 #include "stdlib/stats/base/dists/chisquare/stdev.h"
-#include "stdlib/math/base/assert/is_nan.h"
 #include "stdlib/math/base/special/sqrt.h"
+#include "stdlib/stats/base/dists/chisquare/variance.h"
 
 /**
 * Returns the standard deviation of a chi-squared distribution.
@@ -31,8 +31,5 @@
 * // returns ~4.243
 */
 double stdlib_base_dists_chisquare_stdev( const double k ) {
-	if ( stdlib_base_is_nan( k ) || k < 0.0 ) {
-		return 0.0/0.0; //NaN
-	}
-	return stdlib_base_sqrt( 2.0 * k );
+	return stdlib_base_sqrt( stdlib_base_dists_chisquare_variance( k ) );
 }
diff --git a/lib/node_modules/@stdlib/stats/base/dists/hypergeometric/stdev/lib/main.js b/lib/node_modules/@stdlib/stats/base/dists/hypergeometric/stdev/lib/main.js
index 94417c82e2dc..2a06b32d290b 100644
--- a/lib/node_modules/@stdlib/stats/base/dists/hypergeometric/stdev/lib/main.js
+++ b/lib/node_modules/@stdlib/stats/base/dists/hypergeometric/stdev/lib/main.js
@@ -20,9 +20,8 @@
 
 // MODULES //
 
-var isNonNegativeInteger = require( '@stdlib/math/base/assert/is-nonnegative-integer' );
 var sqrt = require( '@stdlib/math/base/special/sqrt' );
-var PINF = require( '@stdlib/constants/float64/pinf' );
+var variance = require( '@stdlib/stats/base/dists/hypergeometric/variance' );
 
 
 // MAIN //
@@ -72,18 +71,7 @@ var PINF = require( '@stdlib/constants/float64/pinf' );
 * // returns NaN
 */
 function stdev( N, K, n ) {
-	if (
-		!isNonNegativeInteger( N ) ||
-		!isNonNegativeInteger( K ) ||
-		!isNonNegativeInteger( n ) ||
-		N === PINF ||
-		K === PINF ||
-		K > N ||
-		n > N
-	) {
-		return NaN;
-	}
-	return sqrt( n * ( K/N ) * ( (N-K)/N ) * ( (N-n)/(N-1) ) );
+	return sqrt( variance( N, K, n ) );
 }
 
 
diff --git a/lib/node_modules/@stdlib/stats/base/dists/hypergeometric/stdev/manifest.json b/lib/node_modules/@stdlib/stats/base/dists/hypergeometric/stdev/manifest.json
index 4229e8aea358..7329e8956f83 100644
--- a/lib/node_modules/@stdlib/stats/base/dists/hypergeometric/stdev/manifest.json
+++ b/lib/node_modules/@stdlib/stats/base/dists/hypergeometric/stdev/manifest.json
@@ -39,7 +39,8 @@
       "libpath": [],
       "dependencies": [
         "@stdlib/math/base/napi/ternary",
-        "@stdlib/math/base/special/sqrt"
+        "@stdlib/math/base/special/sqrt",
+        "@stdlib/stats/base/dists/hypergeometric/variance"
       ]
     },
     {
@@ -55,6 +56,7 @@
       "libpath": [],
       "dependencies": [
         "@stdlib/math/base/special/sqrt",
+        "@stdlib/stats/base/dists/hypergeometric/variance",
         "@stdlib/math/base/special/ceil"
       ]
     },
@@ -71,6 +73,7 @@
       "libpath": [],
       "dependencies": [
         "@stdlib/math/base/special/sqrt",
+        "@stdlib/stats/base/dists/hypergeometric/variance",
         "@stdlib/math/base/special/ceil"
       ]
     }
diff --git a/lib/node_modules/@stdlib/stats/base/dists/hypergeometric/stdev/src/main.c b/lib/node_modules/@stdlib/stats/base/dists/hypergeometric/stdev/src/main.c
index 41d0ce981fc2..c395a86edbbe 100644
--- a/lib/node_modules/@stdlib/stats/base/dists/hypergeometric/stdev/src/main.c
+++ b/lib/node_modules/@stdlib/stats/base/dists/hypergeometric/stdev/src/main.c
@@ -18,7 +18,7 @@
 
 #include "stdlib/stats/base/dists/hypergeometric/stdev.h"
 #include "stdlib/math/base/special/sqrt.h"
-#include <stdint.h>
+#include "stdlib/stats/base/dists/hypergeometric/variance.h"
 
 /**
 * Returns the standard deviation of a hypergeometric distribution.
@@ -33,13 +33,5 @@
 * // returns ~0.829
 */
 double stdlib_base_dists_hypergeometric_stdev( const int32_t N, const int32_t K, const int32_t n ) {
-	double variance;
-	double p;
-
-	if (  N < 0 || K < 0 || n < 0 || K > N || n > N ) {
-		return 0.0/0.0; // NaN
-	}
-	p = (double)K / (double)N;
-	variance = n * p * ( 1.0-p ) * ( (double)(N-n)/(double)(N-1) );
-	return stdlib_base_sqrt( variance );
+	return stdlib_base_sqrt( stdlib_base_dists_hypergeometric_variance( N, K, n ) );
 }
diff --git a/lib/node_modules/@stdlib/stats/base/dists/kumaraswamy/stdev/lib/main.js b/lib/node_modules/@stdlib/stats/base/dists/kumaraswamy/stdev/lib/main.js
index 4e8b3dde0c0f..8e9a7c69bd21 100644
--- a/lib/node_modules/@stdlib/stats/base/dists/kumaraswamy/stdev/lib/main.js
+++ b/lib/node_modules/@stdlib/stats/base/dists/kumaraswamy/stdev/lib/main.js
@@ -20,9 +20,8 @@
 
 // MODULES //
 
-var isnan = require( '@stdlib/math/base/assert/is-nan' );
-var beta = require( '@stdlib/math/base/special/beta' );
 var sqrt = require( '@stdlib/math/base/special/sqrt' );
+var variance = require( '@stdlib/stats/base/dists/kumaraswamy/variance' );
 
 
 // MAIN //
@@ -63,19 +62,7 @@ var sqrt = require( '@stdlib/math/base/special/sqrt' );
 * // returns NaN
 */
 function stdev( a, b ) {
-	var m1;
-	var m2;
-	if (
-		isnan( a ) ||
-		a <= 0.0 ||
-		isnan( b ) ||
-		b <= 0.0
-	) {
-		return NaN;
-	}
-	m1 = b * beta( 1.0 + ( 1.0/a ), b );
-	m2 = b * beta( 1.0 + ( 2.0/a ), b );
-	return sqrt( m2 - ( m1*m1 ) );
+	return sqrt( variance( a, b ) );
 }
 
 
diff --git a/lib/node_modules/@stdlib/stats/base/dists/kumaraswamy/stdev/manifest.json b/lib/node_modules/@stdlib/stats/base/dists/kumaraswamy/stdev/manifest.json
index f1589a6b3c20..36571ca1e231 100644
--- a/lib/node_modules/@stdlib/stats/base/dists/kumaraswamy/stdev/manifest.json
+++ b/lib/node_modules/@stdlib/stats/base/dists/kumaraswamy/stdev/manifest.json
@@ -39,9 +39,8 @@
       "libpath": [],
       "dependencies": [
         "@stdlib/math/base/napi/binary",
-        "@stdlib/math/base/assert/is-nan",
-        "@stdlib/math/base/special/beta",
-        "@stdlib/math/base/special/sqrt"
+        "@stdlib/math/base/special/sqrt",
+        "@stdlib/stats/base/dists/kumaraswamy/variance"
       ]
     },
     {
@@ -56,9 +55,8 @@
       "libraries": [],
       "libpath": [],
       "dependencies": [
-        "@stdlib/math/base/assert/is-nan",
-        "@stdlib/math/base/special/beta",
         "@stdlib/math/base/special/sqrt",
+        "@stdlib/stats/base/dists/kumaraswamy/variance",
         "@stdlib/constants/float64/eps"
       ]
     },
@@ -74,9 +72,8 @@
       "libraries": [],
       "libpath": [],
       "dependencies": [
-        "@stdlib/math/base/assert/is-nan",
-        "@stdlib/math/base/special/beta",
-        "@stdlib/math/base/special/sqrt"
+        "@stdlib/math/base/special/sqrt",
+        "@stdlib/stats/base/dists/kumaraswamy/variance"
       ]
     }
   ]
diff --git a/lib/node_modules/@stdlib/stats/base/dists/kumaraswamy/stdev/src/main.c b/lib/node_modules/@stdlib/stats/base/dists/kumaraswamy/stdev/src/main.c
index 733a8b3418d0..049be831c014 100644
--- a/lib/node_modules/@stdlib/stats/base/dists/kumaraswamy/stdev/src/main.c
+++ b/lib/node_modules/@stdlib/stats/base/dists/kumaraswamy/stdev/src/main.c
@@ -17,9 +17,8 @@
 */
 
 #include "stdlib/stats/base/dists/kumaraswamy/stdev.h"
-#include "stdlib/math/base/assert/is_nan.h"
-#include "stdlib/math/base/special/beta.h"
 #include "stdlib/math/base/special/sqrt.h"
+#include "stdlib/stats/base/dists/kumaraswamy/variance.h"
 
 /**
 * Returns the standard deviation of a Kumaraswamy's double bounded distribution.
@@ -33,18 +32,5 @@
 * // returns ~0.298
 */
 double stdlib_base_dists_kumaraswamy_stdev( const double a, const double b ) {
-	double m1;
-	double m2;
-	if (
-		stdlib_base_is_nan( a ) ||
-		a <= 0.0 ||
-		stdlib_base_is_nan( b ) ||
-		b <= 0.0
-	) {
-		return 0.0/0.0; // NaN
-	}
-	m1 = b * stdlib_base_beta( 1.0 + ( 1.0/a ), b );
-	m2 = b * stdlib_base_beta( 1.0 + ( 2.0/a ), b );
-	return stdlib_base_sqrt( m2 - ( m1*m1 ) );
+	return stdlib_base_sqrt( stdlib_base_dists_kumaraswamy_variance( a, b ) );
 }
-
diff --git a/lib/node_modules/@stdlib/stats/base/dists/lognormal/stdev/lib/main.js b/lib/node_modules/@stdlib/stats/base/dists/lognormal/stdev/lib/main.js
index 66e20dfa3ca5..f1d84ec9b454 100644
--- a/lib/node_modules/@stdlib/stats/base/dists/lognormal/stdev/lib/main.js
+++ b/lib/node_modules/@stdlib/stats/base/dists/lognormal/stdev/lib/main.js
@@ -20,9 +20,8 @@
 
 // MODULES //
 
-var isnan = require( '@stdlib/math/base/assert/is-nan' );
 var sqrt = require( '@stdlib/math/base/special/sqrt' );
-var exp = require( '@stdlib/math/base/special/exp' );
+var variance = require( '@stdlib/stats/base/dists/lognormal/variance' );
 
 
 // MAIN //
@@ -55,16 +54,7 @@ var exp = require( '@stdlib/math/base/special/exp' );
 * // returns NaN
 */
 function stdev( mu, sigma ) {
-	var s2;
-	if (
-		isnan( mu ) ||
-		isnan( sigma ) ||
-		sigma <= 0.0
-	) {
-		return NaN;
-	}
-	s2 = sigma*sigma;
-	return sqrt( ( exp( s2 ) - 1.0 ) * exp( ( 2.0*mu ) + s2 ) );
+	return sqrt( variance( mu, sigma ) );
 }
 
 
diff --git a/lib/node_modules/@stdlib/stats/base/dists/lognormal/stdev/manifest.json b/lib/node_modules/@stdlib/stats/base/dists/lognormal/stdev/manifest.json
index 7a0095b9cd91..4707b240a9d8 100644
--- a/lib/node_modules/@stdlib/stats/base/dists/lognormal/stdev/manifest.json
+++ b/lib/node_modules/@stdlib/stats/base/dists/lognormal/stdev/manifest.json
@@ -39,9 +39,8 @@
       "libpath": [],
       "dependencies": [
         "@stdlib/math/base/napi/binary",
-        "@stdlib/math/base/assert/is-nan",
-        "@stdlib/math/base/special/exp",
-        "@stdlib/math/base/special/sqrt"
+        "@stdlib/math/base/special/sqrt",
+        "@stdlib/stats/base/dists/lognormal/variance"
       ]
     },
     {
@@ -56,10 +55,9 @@
       "libraries": [],
       "libpath": [],
       "dependencies": [
-        "@stdlib/math/base/assert/is-nan",
         "@stdlib/constants/float64/eps",
-        "@stdlib/math/base/special/exp",
-        "@stdlib/math/base/special/sqrt"
+        "@stdlib/math/base/special/sqrt",
+        "@stdlib/stats/base/dists/lognormal/variance"
       ]
     },
     {
@@ -74,9 +72,8 @@
       "libraries": [],
       "libpath": [],
       "dependencies": [
-        "@stdlib/math/base/assert/is-nan",
-        "@stdlib/math/base/special/exp",
-        "@stdlib/math/base/special/sqrt"
+        "@stdlib/math/base/special/sqrt",
+        "@stdlib/stats/base/dists/lognormal/variance"
       ]
     }
   ]
diff --git a/lib/node_modules/@stdlib/stats/base/dists/lognormal/stdev/src/main.c b/lib/node_modules/@stdlib/stats/base/dists/lognormal/stdev/src/main.c
index 8d344ca711b9..554ccb3f0634 100644
--- a/lib/node_modules/@stdlib/stats/base/dists/lognormal/stdev/src/main.c
+++ b/lib/node_modules/@stdlib/stats/base/dists/lognormal/stdev/src/main.c
@@ -17,9 +17,8 @@
 */
 
 #include "stdlib/stats/base/dists/lognormal/stdev.h"
-#include "stdlib/math/base/assert/is_nan.h"
-#include "stdlib/math/base/special/exp.h"
 #include "stdlib/math/base/special/sqrt.h"
+#include "stdlib/stats/base/dists/lognormal/variance.h"
 
 /**
 * Returns the standard deviation for a lognormal distribution with location `mu` and scale `sigma`.
@@ -33,14 +32,5 @@
 * // returns ~2.161
 */
 double stdlib_base_dists_lognormal_stdev( const double mu, const double sigma ) {
-	double s2;
-	if (
-		stdlib_base_is_nan( mu ) ||
-		stdlib_base_is_nan( sigma ) ||
-		sigma <= 0.0
-	) {
-		return 0.0 / 0.0; // NaN
-	}
-	s2 = sigma * sigma;
-	return stdlib_base_sqrt( ( stdlib_base_exp( s2 ) - 1.0 ) * stdlib_base_exp( ( 2.0 * mu ) + s2 ) );
+	return stdlib_base_sqrt( stdlib_base_dists_lognormal_variance( mu, sigma ) );
 }
diff --git a/lib/node_modules/@stdlib/stats/base/dists/pareto-type1/stdev/lib/main.js b/lib/node_modules/@stdlib/stats/base/dists/pareto-type1/stdev/lib/main.js
index 79247ac299b5..5f95d04ee006 100644
--- a/lib/node_modules/@stdlib/stats/base/dists/pareto-type1/stdev/lib/main.js
+++ b/lib/node_modules/@stdlib/stats/base/dists/pareto-type1/stdev/lib/main.js
@@ -20,10 +20,8 @@
 
 // MODULES //
 
-var isnan = require( '@stdlib/math/base/assert/is-nan' );
 var sqrt = require( '@stdlib/math/base/special/sqrt' );
-var pow = require( '@stdlib/math/base/special/pow' );
-var PINF = require( '@stdlib/constants/float64/pinf' );
+var variance = require( '@stdlib/stats/base/dists/pareto-type1/variance' );
 
 
 // MAIN //
@@ -64,20 +62,7 @@ var PINF = require( '@stdlib/constants/float64/pinf' );
 * // returns NaN
 */
 function stdev( alpha, beta ) {
-	var out;
-	if (
-		isnan( alpha ) ||
-		alpha <= 0.0 ||
-		isnan( beta ) ||
-		beta <= 0.0
-	) {
-		return NaN;
-	}
-	if ( alpha < 2.0 ) {
-		return PINF;
-	}
-	out = ( (beta*beta) * alpha ) / ( pow( alpha-1.0, 2.0 ) * ( alpha-2.0 ) );
-	return sqrt( out );
+	return sqrt( variance( alpha, beta ) );
 }
 
 
diff --git a/lib/node_modules/@stdlib/stats/base/dists/pareto-type1/stdev/manifest.json b/lib/node_modules/@stdlib/stats/base/dists/pareto-type1/stdev/manifest.json
index 9e265f4448e4..38db5587a87c 100644
--- a/lib/node_modules/@stdlib/stats/base/dists/pareto-type1/stdev/manifest.json
+++ b/lib/node_modules/@stdlib/stats/base/dists/pareto-type1/stdev/manifest.json
@@ -39,10 +39,8 @@
       "libpath": [],
       "dependencies": [
         "@stdlib/math/base/napi/binary",
-        "@stdlib/math/base/assert/is-nan",
         "@stdlib/math/base/special/sqrt",
-        "@stdlib/math/base/special/pow",
-        "@stdlib/constants/float64/pinf"
+        "@stdlib/stats/base/dists/pareto-type1/variance"
       ]
     },
     {
@@ -57,10 +55,8 @@
       "libraries": [],
       "libpath": [],
       "dependencies": [
-        "@stdlib/math/base/assert/is-nan",
         "@stdlib/math/base/special/sqrt",
-        "@stdlib/math/base/special/pow",
-        "@stdlib/constants/float64/pinf"
+        "@stdlib/stats/base/dists/pareto-type1/variance"
       ]
     },
     {
@@ -75,10 +71,8 @@
       "libraries": [],
       "libpath": [],
       "dependencies": [
-        "@stdlib/math/base/assert/is-nan",
         "@stdlib/math/base/special/sqrt",
-        "@stdlib/math/base/special/pow",
-        "@stdlib/constants/float64/pinf"
+        "@stdlib/stats/base/dists/pareto-type1/variance"
       ]
     }
   ]
diff --git a/lib/node_modules/@stdlib/stats/base/dists/pareto-type1/stdev/src/main.c b/lib/node_modules/@stdlib/stats/base/dists/pareto-type1/stdev/src/main.c
index b6ee53700f55..91ba0f54d6c7 100644
--- a/lib/node_modules/@stdlib/stats/base/dists/pareto-type1/stdev/src/main.c
+++ b/lib/node_modules/@stdlib/stats/base/dists/pareto-type1/stdev/src/main.c
@@ -17,10 +17,8 @@
 */
 
 #include "stdlib/stats/base/dists/pareto-type1/stdev.h"
-#include "stdlib/math/base/assert/is_nan.h"
 #include "stdlib/math/base/special/sqrt.h"
-#include "stdlib/math/base/special/pow.h"
-#include "stdlib/constants/float64/pinf.h"
+#include "stdlib/stats/base/dists/pareto-type1/variance.h"
 
 /**
 * Returns the standard deviation of a Pareto (Type I) distribution.
@@ -34,18 +32,5 @@
 * // returns ~5.657
 */
 double stdlib_base_dists_pareto_type1_stdev( const double alpha, const double beta ) {
-	double out;
-	if (
-		stdlib_base_is_nan( alpha ) ||
-		alpha <= 0.0 ||
-		stdlib_base_is_nan( beta ) ||
-		beta <= 0.0
-	) {
-		return 0.0 / 0.0; // NaN
-	}
-	if ( alpha < 2.0 ) {
-		return STDLIB_CONSTANT_FLOAT64_PINF;
-	}
-	out = ( ( beta*beta ) * alpha ) / ( stdlib_base_pow( alpha-1.0, 2.0 ) * ( alpha-2.0 ) );
-	return stdlib_base_sqrt( out );
+	return stdlib_base_sqrt( stdlib_base_dists_pareto_type1_variance( alpha, beta ) );
 }
diff --git a/lib/node_modules/@stdlib/stats/base/dists/poisson/stdev/lib/main.js b/lib/node_modules/@stdlib/stats/base/dists/poisson/stdev/lib/main.js
index ba06b60ec54d..5b21de6dd354 100644
--- a/lib/node_modules/@stdlib/stats/base/dists/poisson/stdev/lib/main.js
+++ b/lib/node_modules/@stdlib/stats/base/dists/poisson/stdev/lib/main.js
@@ -20,8 +20,8 @@
 
 // MODULES //
 
-var isnan = require( '@stdlib/math/base/assert/is-nan' );
 var sqrt = require( '@stdlib/math/base/special/sqrt' );
+var variance = require( '@stdlib/stats/base/dists/poisson/variance' );
 
 
 // MAIN //
@@ -49,10 +49,7 @@ var sqrt = require( '@stdlib/math/base/special/sqrt' );
 * // returns NaN
 */
 function stdev( lambda ) {
-	if ( isnan( lambda ) || lambda < 0.0 ) {
-		return NaN;
-	}
-	return sqrt( lambda );
+	return sqrt( variance( lambda ) );
 }
 
 
diff --git a/lib/node_modules/@stdlib/stats/base/dists/poisson/stdev/manifest.json b/lib/node_modules/@stdlib/stats/base/dists/poisson/stdev/manifest.json
index 546b58881775..0b0d3a84753f 100644
--- a/lib/node_modules/@stdlib/stats/base/dists/poisson/stdev/manifest.json
+++ b/lib/node_modules/@stdlib/stats/base/dists/poisson/stdev/manifest.json
@@ -39,8 +39,8 @@
       "libpath": [],
       "dependencies": [
         "@stdlib/math/base/napi/unary",
-        "@stdlib/math/base/assert/is-nan",
-        "@stdlib/math/base/special/sqrt"
+        "@stdlib/math/base/special/sqrt",
+        "@stdlib/stats/base/dists/poisson/variance"
       ]
     },
     {
@@ -55,8 +55,8 @@
       "libraries": [],
       "libpath": [],
       "dependencies": [
-        "@stdlib/math/base/assert/is-nan",
-        "@stdlib/math/base/special/sqrt"
+        "@stdlib/math/base/special/sqrt",
+        "@stdlib/stats/base/dists/poisson/variance"
       ]
     },
     {
@@ -71,8 +71,8 @@
       "libraries": [],
       "libpath": [],
       "dependencies": [
-        "@stdlib/math/base/assert/is-nan",
-        "@stdlib/math/base/special/sqrt"
+        "@stdlib/math/base/special/sqrt",
+        "@stdlib/stats/base/dists/poisson/variance"
       ]
     }
   ]
diff --git a/lib/node_modules/@stdlib/stats/base/dists/poisson/stdev/src/main.c b/lib/node_modules/@stdlib/stats/base/dists/poisson/stdev/src/main.c
index 80f20f0bb68b..0ace0ea2cd0f 100644
--- a/lib/node_modules/@stdlib/stats/base/dists/poisson/stdev/src/main.c
+++ b/lib/node_modules/@stdlib/stats/base/dists/poisson/stdev/src/main.c
@@ -17,8 +17,8 @@
 */
 
 #include "stdlib/stats/base/dists/poisson/stdev.h"
-#include "stdlib/math/base/assert/is_nan.h"
 #include "stdlib/math/base/special/sqrt.h"
+#include "stdlib/stats/base/dists/poisson/variance.h"
 
 /**
 * Returns the standard deviation of a Poisson distribution with parameter `lambda`.
@@ -31,11 +31,5 @@
 * // returns 3.0
 */
 double stdlib_base_dists_poisson_stdev( const double lambda ) {
-	if (
-		stdlib_base_is_nan( lambda ) ||
-		lambda < 0.0
-	) {
-		return 0.0/0.0; // NaN
-	}
-	return stdlib_base_sqrt( lambda );
+	return stdlib_base_sqrt( stdlib_base_dists_poisson_variance( lambda ) );
 }
diff --git a/lib/node_modules/@stdlib/stats/base/dists/t/stdev/lib/main.js b/lib/node_modules/@stdlib/stats/base/dists/t/stdev/lib/main.js
index 32e893097a7b..5e7267024bcd 100644
--- a/lib/node_modules/@stdlib/stats/base/dists/t/stdev/lib/main.js
+++ b/lib/node_modules/@stdlib/stats/base/dists/t/stdev/lib/main.js
@@ -20,9 +20,8 @@
 
 // MODULES //
 
-var isnan = require( '@stdlib/math/base/assert/is-nan' );
 var sqrt = require( '@stdlib/math/base/special/sqrt' );
-var PINF = require( '@stdlib/constants/float64/pinf' );
+var variance = require( '@stdlib/stats/base/dists/t/variance' );
 
 
 // MAIN //
@@ -54,13 +53,7 @@ var PINF = require( '@stdlib/constants/float64/pinf' );
 * // returns NaN
 */
 function stdev( v ) {
-	if ( isnan( v ) || v <= 1.0 ) {
-		return NaN;
-	}
-	if ( v <= 2.0 ) {
-		return PINF;
-	}
-	return sqrt( v / ( v - 2.0 ) );
+	return sqrt( variance( v ) );
 }
 
 
diff --git a/lib/node_modules/@stdlib/stats/base/dists/t/stdev/manifest.json b/lib/node_modules/@stdlib/stats/base/dists/t/stdev/manifest.json
index 19b4bb84411b..fe212a46d56b 100644
--- a/lib/node_modules/@stdlib/stats/base/dists/t/stdev/manifest.json
+++ b/lib/node_modules/@stdlib/stats/base/dists/t/stdev/manifest.json
@@ -39,9 +39,8 @@
       "libpath": [],
       "dependencies": [
         "@stdlib/math/base/napi/unary",
-        "@stdlib/math/base/assert/is-nan",
         "@stdlib/math/base/special/sqrt",
-        "@stdlib/constants/float64/pinf"
+        "@stdlib/stats/base/dists/t/variance"
       ]
     },
     {
@@ -56,9 +55,8 @@
       "libraries": [],
       "libpath": [],
       "dependencies": [
-        "@stdlib/math/base/assert/is-nan",
         "@stdlib/math/base/special/sqrt",
-        "@stdlib/constants/float64/pinf"
+        "@stdlib/stats/base/dists/t/variance"
       ]
     },
     {
@@ -73,9 +71,8 @@
       "libraries": [],
       "libpath": [],
       "dependencies": [
-        "@stdlib/math/base/assert/is-nan",
         "@stdlib/math/base/special/sqrt",
-        "@stdlib/constants/float64/pinf"
+        "@stdlib/stats/base/dists/t/variance"
       ]
     }
   ]
diff --git a/lib/node_modules/@stdlib/stats/base/dists/t/stdev/src/main.c b/lib/node_modules/@stdlib/stats/base/dists/t/stdev/src/main.c
index 12e06afd4f7a..b8cfb20958e7 100644
--- a/lib/node_modules/@stdlib/stats/base/dists/t/stdev/src/main.c
+++ b/lib/node_modules/@stdlib/stats/base/dists/t/stdev/src/main.c
@@ -17,9 +17,8 @@
 */
 
 #include "stdlib/stats/base/dists/t/stdev.h"
-#include "stdlib/math/base/assert/is_nan.h"
 #include "stdlib/math/base/special/sqrt.h"
-#include "stdlib/constants/float64/pinf.h"
+#include "stdlib/stats/base/dists/t/variance.h"
 
 /**
 * Returns the standard deviation of a Student's t distribution.
@@ -32,11 +31,5 @@
 * // returns ~1.134
 */
 double stdlib_base_dists_t_stdev( const double v ) {
-	if ( stdlib_base_is_nan( v ) || v <= 1.0 ) {
-		return 0.0 / 0.0; // NaN
-	}
-	if ( v <= 2.0 ) {
-		return STDLIB_CONSTANT_FLOAT64_PINF;
-	}
-	return stdlib_base_sqrt( v / ( v - 2.0 ) );
+	return stdlib_base_sqrt( stdlib_base_dists_t_variance( v ) );
 }
diff --git a/lib/node_modules/@stdlib/stats/base/dists/triangular/stdev/lib/main.js b/lib/node_modules/@stdlib/stats/base/dists/triangular/stdev/lib/main.js
index c7012c662b6b..df370a5d0702 100644
--- a/lib/node_modules/@stdlib/stats/base/dists/triangular/stdev/lib/main.js
+++ b/lib/node_modules/@stdlib/stats/base/dists/triangular/stdev/lib/main.js
@@ -20,8 +20,8 @@
 
 // MODULES //
 
-var isnan = require( '@stdlib/math/base/assert/is-nan' );
 var sqrt = require( '@stdlib/math/base/special/sqrt' );
+var variance = require( '@stdlib/stats/base/dists/triangular/variance' );
 
 
 // MAIN //
@@ -67,15 +67,7 @@ var sqrt = require( '@stdlib/math/base/special/sqrt' );
 * // returns NaN
 */
 function stdev( a, b, c ) {
-	if (
-		isnan( a ) ||
-		isnan( b ) ||
-		isnan( c ) ||
-		!( a <= c && c <= b )
-	) {
-		return NaN;
-	}
-	return sqrt( ( (a*a) + (b*b) + (c*c) - (a*b) - (a*c) - (b*c) ) / 18.0 );
+	return sqrt( variance( a, b, c ) );
 }
 
 
diff --git a/lib/node_modules/@stdlib/stats/base/dists/triangular/stdev/manifest.json b/lib/node_modules/@stdlib/stats/base/dists/triangular/stdev/manifest.json
index b050c2ec550f..a1ec01aa013b 100644
--- a/lib/node_modules/@stdlib/stats/base/dists/triangular/stdev/manifest.json
+++ b/lib/node_modules/@stdlib/stats/base/dists/triangular/stdev/manifest.json
@@ -39,8 +39,8 @@
       "libpath": [],
       "dependencies": [
         "@stdlib/math/base/napi/ternary",
-        "@stdlib/math/base/assert/is-nan",
-        "@stdlib/math/base/special/sqrt"
+        "@stdlib/math/base/special/sqrt",
+        "@stdlib/stats/base/dists/triangular/variance"
       ]
     },
     {
@@ -55,8 +55,8 @@
       "libraries": [],
       "libpath": [],
       "dependencies": [
-        "@stdlib/math/base/assert/is-nan",
-        "@stdlib/math/base/special/sqrt"
+        "@stdlib/math/base/special/sqrt",
+        "@stdlib/stats/base/dists/triangular/variance"
       ]
     },
     {
@@ -71,8 +71,8 @@
       "libraries": [],
       "libpath": [],
       "dependencies": [
-        "@stdlib/math/base/assert/is-nan",
-        "@stdlib/math/base/special/sqrt"
+        "@stdlib/math/base/special/sqrt",
+        "@stdlib/stats/base/dists/triangular/variance"
       ]
     }
   ]
diff --git a/lib/node_modules/@stdlib/stats/base/dists/triangular/stdev/src/main.c b/lib/node_modules/@stdlib/stats/base/dists/triangular/stdev/src/main.c
index 61d8a28bf115..b8c00dc2f411 100644
--- a/lib/node_modules/@stdlib/stats/base/dists/triangular/stdev/src/main.c
+++ b/lib/node_modules/@stdlib/stats/base/dists/triangular/stdev/src/main.c
@@ -17,8 +17,8 @@
 */
 
 #include "stdlib/stats/base/dists/triangular/stdev.h"
-#include "stdlib/math/base/assert/is_nan.h"
 #include "stdlib/math/base/special/sqrt.h"
+#include "stdlib/stats/base/dists/triangular/variance.h"
 
 /**
 * Returns the standard deviation of a triangular distribution.
@@ -33,13 +33,5 @@
 * // returns ~0.204
 */
 double stdlib_base_dists_triangular_stdev( const double a, const double b, const double c ) {
-	if (
-		stdlib_base_is_nan( a ) ||
-		stdlib_base_is_nan( b ) ||
-		stdlib_base_is_nan( c ) ||
-		!( a <= c && c <= b )
-	) {
-		return 0.0/0.0; // NaN
-	}
-	return stdlib_base_sqrt( ( ( a*a ) + ( b*b ) + ( c*c ) - ( a*b ) - ( a*c ) - ( b*c ) ) / 18.0 );
+	return stdlib_base_sqrt( stdlib_base_dists_triangular_variance( a, b, c ) );
 }

From 2d47fe6d1b1da7f265354b7e43edf5453b4bca71 Mon Sep 17 00:00:00 2001
From: Athan <kgryte@gmail.com>
Date: Sun, 12 Apr 2026 04:18:18 -0700
Subject: [PATCH 2/2] Apply suggestions from code review

Co-authored-by: Athan <kgryte@gmail.com>
Signed-off-by: Athan <kgryte@gmail.com>
---
 .../@stdlib/stats/base/dists/hypergeometric/stdev/src/main.c     | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/node_modules/@stdlib/stats/base/dists/hypergeometric/stdev/src/main.c b/lib/node_modules/@stdlib/stats/base/dists/hypergeometric/stdev/src/main.c
index c395a86edbbe..94443c608b04 100644
--- a/lib/node_modules/@stdlib/stats/base/dists/hypergeometric/stdev/src/main.c
+++ b/lib/node_modules/@stdlib/stats/base/dists/hypergeometric/stdev/src/main.c
@@ -19,6 +19,7 @@
 #include "stdlib/stats/base/dists/hypergeometric/stdev.h"
 #include "stdlib/math/base/special/sqrt.h"
 #include "stdlib/stats/base/dists/hypergeometric/variance.h"
+#include <stdint.h>
 
 /**
 * Returns the standard deviation of a hypergeometric distribution.