Examples with StandardDeviation org.apache.commons.math3.stat.descriptive.moment.StandardDeviation used on opensource projects

Example 21 with StandardDeviation

use of org.apache.commons.math3.stat.descriptive.moment.StandardDeviation in project presto by prestodb.

the class TestDoubleStdDevAggregation method getExpectedValue.

@Override
public Number getExpectedValue(int start, int length) {
    if (length < 2) {
        return null;
    }
    double[] values = new double[length];
    for (int i = 0; i < length; i++) {
        values[i] = start + i;
    }
    StandardDeviation stdDev = new StandardDeviation();
    return stdDev.evaluate(values);
}

Example 22 with StandardDeviation

use of org.apache.commons.math3.stat.descriptive.moment.StandardDeviation in project presto by prestodb.

the class TestLongStdDevPopAggregation method getExpectedValue.

@Override
public Number getExpectedValue(int start, int length) {
    if (length == 0) {
        return null;
    }
    double[] values = new double[length];
    for (int i = 0; i < length; i++) {
        values[i] = start + i;
    }
    StandardDeviation stdDev = new StandardDeviation(false);
    return stdDev.evaluate(values);
}

Example 23 with StandardDeviation

use of org.apache.commons.math3.stat.descriptive.moment.StandardDeviation in project recordinality by cscotta.

the class RecordinalityTest method buildRun.

private Callable<Result> buildRun(final int kSize, final int numRuns, final List<String> lines) {
    return new Callable<Result>() {

        public Result call() throws Exception {
            long start = System.currentTimeMillis();
            final double[] results = new double[numRuns];
            for (int i = 0; i < numRuns; i++) {
                Recordinality rec = new Recordinality(kSize);
                for (String line : lines) rec.observe(line);
                results[i] = rec.estimateCardinality();
            }
            double mean = new Mean().evaluate(results);
            double stdDev = new StandardDeviation().evaluate(results);
            double stdError = stdDev / 3193;
            long runTime = System.currentTimeMillis() - start;
            return new Result(kSize, mean, stdError, runTime);
        }
    };
}