boon/src/main/java/org/boon/primitive/Flt.java
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