feat: add stats/base/dists/bradford/skewness

Author: vivekmaurya001

lib/node_modules/@stdlib/stats/base/dists/bradford/skewness/lib/main.js

@@ -23,7 +23,7 @@
 var isnan = require( '@stdlib/math/base/assert/is-nan' );
 var SQRT2 = require( '@stdlib/constants/float64/sqrt-two' );
 var sqrt = require( '@stdlib/math/base/special/sqrt' );
-var log1p = require( '@stdlib/math/base/special/log1p' );
+var ln = require( '@stdlib/math/base/special/ln' );
 
 
 // MAIN //
@@ -56,7 +56,7 @@ function skewness( c ) {
 	if ( isnan( c ) || c <= 0.0 ) {
 		return NaN;
 	}
-	p = log1p( c );
+	p = ln( 1.0 + c );
 	ans = SQRT2*( (12*c*c) - (9*c*p*(c+2)) + (2*p*p*((c*(c+3)) + 3)) );
 	ans /= sqrt(c*((c*(p-2)) + (2*p)))*( (3*c*(p-2)) + (6*p));
 	return ans;