List of usage examples for org.apache.commons.math3.stat.descriptive.moment Mean Mean
public Mean(Mean original) throws NullArgumentException
From source file:org.apereo.portal.events.aggr.stat.JpaStatisticalSummary.java
private Mean _getMean() { if (this.mean == null) { this.mean = new Mean(this._getSecondMoment()); }/*from w ww . j av a 2 s .co m*/ return this.mean; }