Example usage for org.apache.commons.math3.stat.descriptive StorelessUnivariateStatistic getN

Introduction

In this page you can find the example usage for org.apache.commons.math3.stat.descriptive StorelessUnivariateStatistic getN.

Prototype

long getN();

Source Link

Document

Returns the number of values that have been added.

Usage

From source file:com.cloudera.oryx.rdf.common.rule.NumericPrediction.java

static NumericPrediction buildNumericPrediction(Iterable<Example> examples) {
    StorelessUnivariateStatistic mean = new Mean();
    for (Example example : examples) {
        mean.increment(((NumericFeature) example.getTarget()).getValue());
    }/*from  w  w w.  j  a v a2 s. com*/
    Preconditions.checkState(mean.getN() > 0);
    return new NumericPrediction((float) mean.getResult(), (int) mean.getN());
}

---

From source file:org.jpmml.evaluator.functions.AggregateFunction.java

@Override
public FieldValue evaluate(List<FieldValue> arguments) {
    StorelessUnivariateStatistic statistic = createStatistic();

    DataType dataType = null;/*from  w  ww.j  a v  a  2s  .  co  m*/

    // "Missing values in the input to an aggregate function are simply ignored"
    Iterable<FieldValue> values = Iterables.filter(arguments, Predicates.notNull());
    for (FieldValue value : values) {
        statistic.increment((value.asNumber()).doubleValue());

        if (dataType != null) {
            dataType = TypeUtil.getResultDataType(dataType, value.getDataType());
        } else

        {
            dataType = value.getDataType();
        }
    }

    if (statistic.getN() == 0) {
        throw new InvalidResultException(null);
    }

    Object result = cast(getResultType(dataType), statistic.getResult());

    return FieldValueUtil.create(result);
}

---