boon/src/main/java/org/boon/primitive/Lng.java
public static long variance(long[] values, final int start, final int length) {
        return (long) Math.round(varianceDouble(values, start, length));
    }
public static long variance(long[] values, final int start, final int length) {
        return (long) Math.round(varianceDouble(values, start, length));
    }
Calculates variance
@param values values
@param start start
@param length length
@return variance