public static float standardDeviation(float[] values, final int start, final int length) {
    """
	Calculate standard deviation.
	
	@param values values
	@param start start
	@param length length
	@return standard deviation
    """
        double variance = varianceDouble(values, start, length);
        return (float)Math.sqrt(variance);
    }
public static float standardDeviation(float[] values, final int start, final int length) {
        double variance = varianceDouble(values, start, length);
        return (float)Math.sqrt(variance);
    }
public static float standardDeviation ( float [ ] values , final int start , final int length ) { double variance = varianceDouble ( values , start , length ) ; return ( float ) Math . sqrt ( variance ) ; }
Calculate standard deviation.

@param values values
@param start start
@param length length
@return standard deviation
Calculate standard deviation .