docs: improve examples of stats/base/dists/chisquare namespace

PR-URL: #2678
Closes: #1619

Co-authored-by: Philipp Burckhardt <[email protected]>
Reviewed-by: Philipp Burckhardt <[email protected]>

Author: kohantikanath

lib/node_modules/@stdlib/stats/base/dists/chisquare/README.md

@@ -108,10 +108,36 @@ var mu = dist.mean;
 <!-- eslint no-undef: "error" -->
 
 ```javascript
-var objectKeys = require( '@stdlib/utils/keys' );
+var roundn = require( '@stdlib/math/base/special/roundn' );
 var chisquare = require( '@stdlib/stats/base/dists/chisquare' );
 
-console.log( objectKeys( chisquare ) );
+// Define degrees of freedom:
+var k = 5.0;
+
+// Calculate distribution properties:
+console.log( 'Mean: %d', chisquare.mean( k ) );
+console.log( 'Median: %d', roundn( chisquare.median( k ), -4 ) );
+console.log( 'Mode: %d', chisquare.mode( k ) );
+console.log( 'Variance: %d', chisquare.variance( k ) );
+console.log( 'Standard Deviation: %d', roundn( chisquare.stdev( k ), -4 ) );
+console.log( 'Skewness: %d', roundn( chisquare.skewness( k ), -4 ) );
+console.log( 'Excess Kurtosis: %d', roundn( chisquare.kurtosis( k ), -4 ) );
+console.log( 'Entropy: %d', roundn( chisquare.entropy( k ), -4 ) );
+
+// Evaluate probability functions:
+var x = 3.0;
+console.log( '\nEvaluating at x = %d', x );
+console.log( 'PDF: %d', roundn( chisquare.pdf( x, k ), -4 ) );
+console.log( 'logPDF: %d', roundn( chisquare.logpdf( x, k ), -4 ) );
+console.log( 'CDF: %d', roundn( chisquare.cdf( x, k ), -4 ) );
+
+// Calculate quantiles:
+var p = 0.7;
+console.log( '\nQuantile at p = %d: %d', p, roundn( chisquare.quantile( p, k ), -4 ) );
+
+// Evaluate moment-generating function:
+var t = 0.1;
+console.log( 'MGF at t = %d: %d', t, roundn( chisquare.mgf( t, k ), -4 ) );
 ```
 
 </section>

lib/node_modules/@stdlib/stats/base/dists/chisquare/examples/index.js

@@ -18,7 +18,33 @@
 
 'use strict';
 
-var objectKeys = require( '@stdlib/utils/keys' );
+var roundn = require( '@stdlib/math/base/special/roundn' );
 var chisquare = require( './../lib' );
 
-console.log( objectKeys( chisquare ) );
+// Define degrees of freedom:
+var k = 5.0;
+
+// Calculate distribution properties:
+console.log( 'Mean: %d', chisquare.mean( k ) );
+console.log( 'Median: %d', roundn( chisquare.median( k ), -4 ) );
+console.log( 'Mode: %d', chisquare.mode( k ) );
+console.log( 'Variance: %d', chisquare.variance( k ) );
+console.log( 'Standard Deviation: %d', roundn( chisquare.stdev( k ), -4 ) );
+console.log( 'Skewness: %d', roundn( chisquare.skewness( k ), -4 ) );
+console.log( 'Excess Kurtosis: %d', roundn( chisquare.kurtosis( k ), -4 ) );
+console.log( 'Entropy: %d', roundn( chisquare.entropy( k ), -4 ) );
+
+// Evaluate probability functions:
+var x = 3.0;
+console.log( '\nEvaluating at x = %d', x );
+console.log( 'PDF: %d', roundn( chisquare.pdf( x, k ), -4 ) );
+console.log( 'logPDF: %d', roundn( chisquare.logpdf( x, k ), -4 ) );
+console.log( 'CDF: %d', roundn( chisquare.cdf( x, k ), -4 ) );
+
+// Calculate quantiles:
+var p = 0.7;
+console.log( '\nQuantile at p = %d: %d', p, roundn( chisquare.quantile( p, k ), -4 ) );
+
+// Evaluate moment-generating function:
+var t = 0.1;
+console.log( 'MGF at t = %d: %d', t, roundn( chisquare.mgf( t, k ), -4 ) );