feat: add variancetk and varianceyc to namespace

---
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---

Author: kgryte

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

@@ -1566,6 +1566,15 @@ setReadOnly( ns, 'variancech', require( '@stdlib/stats/base/ndarray/variancech'
 */
 setReadOnly( ns, 'variancepn', require( '@stdlib/stats/base/ndarray/variancepn' ) );
 
+/**
+* @name variancetk
+* @memberof ns
+* @readonly
+* @type {Function}
+* @see {@link module:@stdlib/stats/base/ndarray/variancetk}
+*/
+setReadOnly( ns, 'variancetk', require( '@stdlib/stats/base/ndarray/variancetk' ) );
+
 /**
 * @name variancewd
 * @memberof ns
@@ -1575,6 +1584,15 @@ setReadOnly( ns, 'variancepn', require( '@stdlib/stats/base/ndarray/variancepn'
 */
 setReadOnly( ns, 'variancewd', require( '@stdlib/stats/base/ndarray/variancewd' ) );
 
+/**
+* @name varianceyc
+* @memberof ns
+* @readonly
+* @type {Function}
+* @see {@link module:@stdlib/stats/base/ndarray/varianceyc}
+*/
+setReadOnly( ns, 'varianceyc', require( '@stdlib/stats/base/ndarray/varianceyc' ) );
+
 /**
 * @name ztest
 * @memberof ns