Correlation – How to Test Differences Between Correlations of Same Two Variables Across Groups

correlation

If I have two (Pearson) correlation coefficients between Variables A and B (for example .657 for males and .876 for females) and I want to test if there is a difference based on gender (as in this case), which of the following phrases should I use to describe this process?

  • Test for equality of the correlation coefficients
  • Test for the difference in the correlation coefficients

I want to use one of the above as a row heading in a table that describes the above results, so I am looking for the one that is more theoretically grounded in statistical terminology.

Best Answer

"Test for equality" is more theoretically correct because you test the (likelihood of) null hypothesis, and it states that the coefficients are equal in the population. But "Test for difference" will be more common way to put it, because it is the alternative hypothesis - the inequality - which a researcher and the reader usually "is after" or has a morbid interest in. Why don't you simply label the table "Correlation coefficients for females and males"?