Apache Commons Math SpearmansCorrelation - 如何使用

Question

我正在尝试使用Apache Commons Math's SpearmansCorrelation，但由于我没有足够的数学/统计背景，我遇到了一些困难。

我研究过Spearman的秩相关性：

• https://statistics.laerd.com/statistical-guides/spearmans-rank-order-correlation-statistical-guide-2.php
• http://geographyfieldwork.com/SpearmansRank.htm

我找到了以下例子：

• http://www.devdaily.com/java/jwarehouse/commons-math/src/main/java/org/apache/commons/math/stat/correlation/SpearmansCorrelation.java.shtml
• http://www.devdaily.com/java/jwarehouse/commons-math/src/test/java/org/apache/commons/math/stat/correlation/SpearmansRankCorrelationTest.java.shtml
• http://www.androidadb.com/class/na/NaturalRanking.html

我想计算两个班级列表之间的相关性：

public class TestClass{
    int rank; // there may be two or more classes with the same rank - will need an averaging ties strategy
}

我从中推断出以下内容：

NaturalRanking naturalRanking = new NaturalRanking(NaNStrategy.FIXED,
        TiesStrategy.AVERAGE);

RealMatrix dataMatrix= createRealMatrix(double[], int, int); // what do I need this matrix for and what parameters do I need to pass?

SpearmansCorrelation sc = SpearmansCorrelation(dataMatrix, naturalRanking);
sc.correlation(double[],double[]);// I have to convert my class into a list of doubles? How? 

Answer 1

对于the link you provided中的示例，您需要做的只是：

new SpearmansCorrelation().correlation(mathsList,englishList);

默认情况下，班级将平均关系。