[UPDATE] change options to opts. [FIX] fcn documentation.

lib/index.js

@@ -44,28 +44,28 @@ var isArray = require( 'validate.io-array' ),
 *
 * @param {Array} arr - input array
 * @param {Object} [options] - function options
-* @param {Boolean} [opts.bias=false] - boolean indicating whether to calculate a biased or unbiased estimate of the variance
+* @param {Boolean} [options.bias=false] - boolean indicating whether to calculate a biased or unbiased estimate of the variance
 * @param {Function} [options.accessor] - accessor function for accessing array values
 * @returns {Number|null} variance or null
 */
-function variance( arr, options ) {
+function variance( arr, opts ) {
 	var bias = false,
 		clbk;
 	if ( !isArray( arr ) ) {
 		throw new TypeError( 'variance()::invalid input argument. Must provide an array. Value: `' + arr + '`.' );
 	}
 	if ( arguments.length > 1  ) {
-		if ( !isObject( options ) ) {
-			throw new TypeError( 'variance()::invalid input argument. Options must be an object. Value: `' + options + '`.' );
+		if ( !isObject( opts ) ) {
+			throw new TypeError( 'variance()::invalid input argument. Options must be an object. Value: `' + opts + '`.' );
 		}
-		if ( options.hasOwnProperty( 'bias' ) ) {
-			bias = options.bias;
+		if ( opts.hasOwnProperty( 'bias' ) ) {
+			bias = opts.bias;
 			if ( !isBoolean( bias ) ) {
 				throw new TypeError( 'variance()::invalid option. Bias option must be a boolean primitive. Value: `' + bias + '`.' );
 			}
 		}
-		if ( options.hasOwnProperty( 'accessor' ) ) {
-			clbk = options.accessor;
+		if ( opts.hasOwnProperty( 'accessor' ) ) {
+			clbk = opts.accessor;
 			if ( !isFunction( clbk ) ) {
 				throw new TypeError( 'variance()::invalid option. Accessor must be a function. Value: `' + clbk + '`.' );
 			}