fair-search/fairsearch-elasticsearch-plugin

package com.purbon.search.fair.lib.fairness;

import com.purbon.search.fair.lib.FairnessTableLookup;
import com.purbon.search.fair.lib.NotImplementedException;
import org.apache.commons.math3.distribution.BinomialDistribution;

public class BionomialFairnessTableLookup implements FairnessTableLookup {

    public int fairness(int trials, float proportion, float significance) {

        // trials == k , p == p
        BinomialDistribution d = new BinomialDistribution(trials, proportion);
        /*
           NOTE:
             if alpha is 0.1,  the output should be the first value x where
             the cumulative probability is bigger than alpha (significance)
         */
        int x = 0;
        do {
            x = x + 1;
        } while (d.cumulativeProbability(x) > significance);

        return x;
    }

    @Override
    public int[] fairnessAsTable(int k, float p, float a) {
        throw new NotImplementedException();
    }
}