java 代码实现计算 icc相关性系数

我可以为您介绍计算ICC相关性系数的Java代码实现方法。您可以使用Apache Commons Math库中的StatisticalAnalysis类来计算。以下是示例代码：

import org.apache.commons.math3.stat.StatUtils;
import org.apache.commons.math3.stat.correlation.Covariance;
import org.apache.commons.math3.stat.correlation.KendallsCorrelation;
import org.apache.commons.math3.stat.correlation.PearsonsCorrelation;
import org.apache.commons.math3.stat.correlation.SpearmansCorrelation;

public class ICCCalculator {
  
  // 计算ICC的方法
  public double calculateICC(double[][] data) {
      
      // 计算rater间的平均值，得到每个item的平均得分
      double[] itemMeans = StatUtils.mean(data);
      
      // 计算rater之间的协方差
      Covariance cov = new Covariance(data);
      double raterVariance = cov.getTrace() / data.length;
      
      // 计算item之间的协方差
      double[] itemVariances = new double[data[0].length];
      for (int i = 0; i < data[0].length; i++) {
          double[] column = getColumn(data, i);
          itemVariances[i] = StatUtils.variance(column);
      }
      double itemVariance = StatUtils.mean(itemVariances);
      
      // 计算ICC
      double icc = (raterVariance - (itemVariance / data[0].length)) / raterVariance;
      return icc;
  }
  
  // 获取矩阵的某一列
  private double[] getColumn(double[][] data, int columnIndex) {
      double[] column = new double[data.length];
      for (int i = 0; i < data.length; i++) {
          column[i] = data[i][columnIndex];
      }
      return column;
  }

  // 测试代码
  public static void main(String[] args) {
      double[][] data = {{2, 3, 4}, {3, 4, 5}, {4, 5, 6}, {5, 6, 7}};
      ICCCalculator iccCalculator = new ICCCalculator();
      double icc = iccCalculator.calculateICC(data);
      System.out.println("ICC: " + icc);
  }
}