function stdev( N, correction, x, strideX, offsetX ) {
	return stdevpn( N, correction, x, strideX, offsetX );
}
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
@param {NonNegativeInteger} offsetX - starting index
@returns {number} standard deviation

@example
var x = [ 2.0, 1.0, 2.0, -2.0, -2.0, 2.0, 3.0, 4.0 ];

var v = stdev( 4, 1, x, 2, 1 );
// returns 2.5