GNU Scientific Library – Reference Manual: Correlation

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### 21.6 Correlation

Function: double gsl_stats_correlation (const double data1[], const size_t stride1, const double data2[], const size_t stride2, const size_t n)

  This function efficiently computes the Pearson correlation coefficient between the datasets data1 and data2 which must both be of the same length n.

Function: double gsl_stats_spearman (const double data1[], const size_t stride1, const double data2[], const size_t stride2, const size_t n, double work[])

  This function computes the Spearman rank correlation coefficient between the datasets data1 and data2 which must both be of the same length n. Additional workspace of size 2*n is required in work. The Spearman rank correlation between vectors x and y is equivalent to the Pearson correlation between the ranked vectors x_R and y_R, where ranks are defined to be the average of the positions of an element in the ascending order of the values.