test: fix alias

Signed-off-by: Athan <kgryte@gmail.com>

Author: kgryte

lib/node_modules/@stdlib/stats/base/ndarray/smeanlipw/test/test.js

@@ -83,7 +83,7 @@ tape( 'if provided an empty ndarray, the function returns `NaN`', function test(
 	x = new Float32Array( [] );
 
 	v = smeanlipw( [ vector( x, 0, 1, 0 ) ] );
-	t.strictEqual( isnan( v ), true, 'returns expected value' );
+	t.strictEqual( isnanf( v ), true, 'returns expected value' );
 
 	t.end();
 });