Apache Commons Math SpearmansCorrelation - 如何使用

Question

我想使用Apache Commons Math's SpearmansCorrelation但我有一些困難，因爲我沒有足夠的數學/統計背景。

我從研究Spearman秩相關：

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

我發現下面的例子：

• 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

我想計算我的課的兩個列表之間的相關性：

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

從我所推導如下：

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

對於在the link you provided中找到的示例，您只需要執行以下操作：

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

默認情況下，該類將平均關係。