Example usage for org.apache.mahout.math.stats OnlineSummarizer getSD

Introduction

In this page you can find the example usage for org.apache.mahout.math.stats OnlineSummarizer getSD.

Prototype

public double getSD() 

Source Link

Usage

From source file:org.conan.mymahout.clustering.streaming.tools.ClusterQualitySummarizer.java

License:Apache License

public static void printSummaries(List<OnlineSummarizer> summarizers, String type, PrintWriter fileOut) {
    double maxDistance = 0;
    for (int i = 0; i < summarizers.size(); ++i) {
        OnlineSummarizer summarizer = summarizers.get(i);
        if (summarizer.getCount() > 1) {
            maxDistance = Math.max(maxDistance, summarizer.getMax());
            System.out.printf("Average distance in cluster %d [%d]: %f\n", i, summarizer.getCount(),
                    summarizer.getMean());
            // If there is just one point in the cluster, quartiles cannot be estimated. We'll just assume all the quartiles
            // equal the only value.
            if (fileOut != null) {
                fileOut.printf("%d,%f,%f,%f,%f,%f,%f,%f,%d,%s\n", i, summarizer.getMean(), summarizer.getSD(),
                        summarizer.getQuartile(0), summarizer.getQuartile(1), summarizer.getQuartile(2),
                        summarizer.getQuartile(3), summarizer.getQuartile(4), summarizer.getCount(), type);
            }//from w w  w.j a v  a2  s . co  m
        } else {
            System.out.printf("Cluster %d is has %d data point. Need atleast 2 data points in a cluster for"
                    + " OnlineSummarizer.\n", i, summarizer.getCount());
        }
    }
    System.out.printf("Num clusters: %d; maxDistance: %f\n", summarizers.size(), maxDistance);
}

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