refactor: use log1p instead of ln

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Author: anandkaranubc

lib/node_modules/@stdlib/stats/base/dists/bradford/pdf/lib/factory.js

@@ -22,7 +22,7 @@
 
 var constantFunction = require( '@stdlib/utils/constant-function' );
 var isnan = require( '@stdlib/math/base/assert/is-nan' );
-var ln = require( '@stdlib/math/base/special/ln' );
+var log1p = require( '@stdlib/math/base/special/log1p' );
 
 
 // MAIN //
@@ -70,7 +70,7 @@ function factory( c ) {
 		) {
 			return NaN;
 		}
-		k = ln( 1.0 + c );
+		k = log1p( c );
 		return c / ( ( 1.0 + ( c * x ) ) * k );
 	}
 }

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

@@ -21,7 +21,7 @@
 // MODULES //
 
 var isnan = require( '@stdlib/math/base/assert/is-nan' );
-var ln = require( '@stdlib/math/base/special/ln' );
+var log1p = require( '@stdlib/math/base/special/log1p' );
 
 
 // MAIN //
@@ -76,7 +76,7 @@ function pdf( x, c ) {
 	) {
 		return NaN;
 	}
-	k = ln( 1.0 + c );
+	k = log1p( c );
 	return c / ( ( 1.0 + ( c * x ) ) * k );
 }
 

lib/node_modules/@stdlib/stats/base/dists/bradford/pdf/test/test.factory.js

@@ -126,7 +126,7 @@ tape( 'the created function evaluates the pdf for `x` given small `c`', function
 			t.equal( y, expected[i], 'x: '+x[i]+'. c: '+c[i]+', y: '+y+', expected: '+expected[i] );
 		} else {
 			delta = abs( y - expected[ i ] );
-			tol = 3.9 * EPS * abs( expected[ i ] );
+			tol = 2.0 * EPS * abs( expected[ i ] );
 			t.ok( delta <= tol, 'within tolerance. x: '+x[ i ]+'. c: '+c[i]+'. y: '+y+'. E: '+expected[ i ]+'. Δ: '+delta+'. tol: '+tol+'.' );
 		}
 	}

lib/node_modules/@stdlib/stats/base/dists/bradford/pdf/test/test.pdf.js

@@ -107,7 +107,7 @@ tape( 'the function evaluates the pdf for `x` given small parameter `c`', functi
 			t.equal( y, expected[i], 'x: '+x[i]+'. c:'+c[i]+', y: '+y+', expected: '+expected[i] );
 		} else {
 			delta = abs( y - expected[ i ] );
-			tol = 3.9 * EPS * abs( expected[ i ] );
+			tol = 2.0 * EPS * abs( expected[ i ] );
 			t.ok( delta <= tol, 'within tolerance. x: '+x[ i ]+'. c: '+c[i]+'. y: '+y+'. E: '+expected[ i ]+'. Δ: '+delta+'. tol: '+tol+'.' );
 		}
 	}