feat: add variance, variancech, variancewd to namespace

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---

Author: kgryte

lib/node_modules/@stdlib/stats/base/ndarray/lib/index.js

@@ -1368,6 +1368,33 @@ setReadOnly( ns, 'sztest', require( '@stdlib/stats/base/ndarray/sztest' ) );
 */
 setReadOnly( ns, 'sztest2', require( '@stdlib/stats/base/ndarray/sztest2' ) );
 
+/**
+* @name variance
+* @memberof ns
+* @readonly
+* @type {Function}
+* @see {@link module:@stdlib/stats/base/ndarray/variance}
+*/
+setReadOnly( ns, 'variance', require( '@stdlib/stats/base/ndarray/variance' ) );
+
+/**
+* @name variancech
+* @memberof ns
+* @readonly
+* @type {Function}
+* @see {@link module:@stdlib/stats/base/ndarray/variancech}
+*/
+setReadOnly( ns, 'variancech', require( '@stdlib/stats/base/ndarray/variancech' ) );
+
+/**
+* @name variancewd
+* @memberof ns
+* @readonly
+* @type {Function}
+* @see {@link module:@stdlib/stats/base/ndarray/variancewd}
+*/
+setReadOnly( ns, 'variancewd', require( '@stdlib/stats/base/ndarray/variancewd' ) );
+
 /**
 * @name ztest
 * @memberof ns