function stdev( N, correction, x, strideX ) {
	return stdevpn( N, correction, x, strideX );
}
Computes the standard deviation of a strided array.

@param {PositiveInteger} N - number of indexed elements
@param {number} correction - degrees of freedom adjustment
@param {NumericArray} x - input array
@param {integer} strideX - stride length
@returns {number} standard deviation

@example
var x = [ 1.0, -2.0, 2.0 ];

var v = stdev( x.length, 1, x, 1 );
// returns ~2.0817