src/main/java/com/cloudbees/jenkins/support/impl/ItemsContent.java
public synchronized double standardDeviation() {
            if (count >= 2) {
                double v = Math.sqrt((count * (double) sumOfSquaredValues - sumOfValues * (double) sumOfValues) / count / (count - 1));
                if (count <= 100) {
                    return roundToSigFig(v, 1); // 0.88*SD to 1.16*SD
                }
                if (count <= 1000) {
                    return roundToSigFig(v, 2); // 0.96*SD to 1.05*SD
                }
                return v;
            } else {
                return Double.NaN;
            }
        }
/**
         * Compute the Standard Deviation (or Variance) as a measure of dispersion
         * @return the standard deviation 
         */
Compute the Standard Deviation (or Variance) as a measure of dispersion
@return the standard deviation
Compute the Standard Deviation ( or Variance ) as a measure of dispersion @return the standard deviation
public synchronized double standardDeviation() {
            if (count >= 2) {
                double v = Math.sqrt((count * (double) sumOfSquaredValues - sumOfValues * (double) sumOfValues) / count / (count - 1));
                if (count <= 100) {
                    return roundToSigFig(v, 1); 
                }
                if (count <= 1000) {
                    return roundToSigFig(v, 2); 
                }
                return v;
            } else {
                return Double.NaN;
            }
        }
public synchronized double standardDeviation ( ) { if ( count >= 2 ) { double v = Math . sqrt ( ( count * ( double ) sumOfSquaredValues - sumOfValues * ( double ) sumOfValues ) / count / ( count - 1 ) ) ; if ( count <= 100 ) { return roundToSigFig ( v , 1 ) ; } if ( count <= 1000 ) { return roundToSigFig ( v , 2 ) ; } return v ; } else { return Double . NaN ; } }
Compute the Standard Deviation (or Variance) as a measure of dispersion
 @return the standard deviation
Compute the Standard Deviation ( or Variance ) as a measure of dispersion @return the standard deviation
// 0.88*SD to 1.16*SD // 0.96*SD to 1.05*SD