Java List Sort interpolateLinearlyQuantile(List sortedDataAscendingOrder, Double p)

Description

Interpolate linearly an quantile Inspired on: http://msenux.redwoods.edu/math/R/boxplot.php

License

LGPL

Parameter

Parameter	Description
sortedDataAscendingOrder	sorted data in ascending order (NOT NULL)
p	percentage

Return

Double interpolated linearly quantile

Declaration

private final static Double interpolateLinearlyQuantile(List<Double> sortedDataAscendingOrder, Double p) 

Method Source Code

//package com.java2s;
//License from project: LGPL 

import java.util.List;

public class Main {
    /**/*  w  w  w  .  jav a2s . co  m*/
     * Interpolate linearly an quantile
     * 
     * Inspired on: http://msenux.redwoods.edu/math/R/boxplot.php
     * 
     * @param sortedDataAscendingOrder sorted data in ascending order (NOT NULL) 
     * @param p percentage
     * @return Double interpolated linearly quantile
     */
    private final static Double interpolateLinearlyQuantile(List<Double> sortedDataAscendingOrder, Double p) {
        int n = sortedDataAscendingOrder.size();
        double position = (1 + (p * (n - 1)));

        int leftIndex = (int) Math.floor(position) - 1;
        int rightIndex = (int) Math.ceil(position) - 1;
        Double quantile;

        if (leftIndex == rightIndex) {
            quantile = sortedDataAscendingOrder.get(leftIndex);
        } else {
            Double leftIndexValue = sortedDataAscendingOrder.get(leftIndex);
            Double rightIndexValue = sortedDataAscendingOrder.get(rightIndex);

            quantile = leftIndexValue + 0.5 * (rightIndexValue - leftIndexValue);
        }

        return quantile;
    }
}

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7. isSorted(Iterable list)
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9. isSorted(List list)