docs: update examples

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---

Author: kgryte

lib/node_modules/@stdlib/stats/incr/nanmsum/README.md

@@ -110,24 +110,17 @@ sum = accumulator();
 <!-- eslint no-undef: "error" -->
 
 ```javascript
-var randu = require( '@stdlib/random/base/randu' );
+var uniform = require( '@stdlib/random/base/uniform' );
+var bernoulli = require( '@stdlib/random/base/bernoulli' );
 var incrnanmsum = require( '@stdlib/stats/incr/nanmsum' );
 
-var accumulator;
-var v;
-var i;
-
 // Initialize an accumulator:
-accumulator = incrnanmsum( 5 );
+var accumulator = incrnanmsum( 5 );
 
 // For each simulated datum, update the moving sum...
+var i;
 for ( i = 0; i < 100; i++ ) {
-    if ( randu() < 0.2 ) {
-        v = NaN;
-    } else {
-        v = randu() * 100.0;
-    }
-    accumulator( v );
+    accumulator( ( bernoulli( 0.8 ) < 1 ) ? NaN : uniform( -50.0, 50.0 ) );
 }
 console.log( accumulator() );
 ```

lib/node_modules/@stdlib/stats/incr/nanmsum/benchmark/benchmark.js

@@ -21,7 +21,6 @@
 // MODULES //
 
 var bench = require( '@stdlib/bench' );
-var randu = require( '@stdlib/random/base/randu' );
 var pkg = require( './../package.json' ).name;
 var incrnanmsum = require( './../lib' );
 
@@ -55,11 +54,7 @@ bench( pkg+'::accumulator', function benchmark( b ) {
 
 	b.tic();
 	for ( i = 0; i < b.iterations; i++ ) {
-		v = randu();
-		if ( v < 0.1 ) {
-			v = NaN;
-		}
-		v = acc( v );
+		v = acc( (i%5) ? i : NaN );
 		if ( v !== v ) {
 			b.fail( 'should not return NaN' );
 		}

lib/node_modules/@stdlib/stats/incr/nanmsum/examples/index.js

@@ -18,25 +18,20 @@
 
 'use strict';
 
-var randu = require( '@stdlib/random/base/randu' );
+var uniform = require( '@stdlib/random/base/uniform' );
+var bernoulli = require( '@stdlib/random/base/bernoulli' );
 var incrnanmsum = require( './../lib' );
 
-var accumulator;
-var sum;
-var v;
-var i;
-
 // Initialize an accumulator:
-accumulator = incrnanmsum( 5 );
+var accumulator = incrnanmsum( 5 );
 
 // For each simulated datum, update the moving sum...
 console.log( '\nValue\tSum\n' );
+var sum;
+var v;
+var i;
 for ( i = 0; i < 100; i++ ) {
-	if ( randu() < 0.2 ) {
-		v = NaN;
-	} else {
-		v = randu() * 100.0;
-	}
+	v = ( bernoulli( 0.8 ) < 1 ) ? NaN : uniform( -50.0, 50.0 );
 	sum = accumulator( v );
 	console.log( '%d\t%d', v.toFixed( 4 ), sum.toFixed( 4 ) );
 }