Greetings, I am performing a simple Pearson's correlation test. Length of both vectors is 40, therefore the resulting df is 38. Nevertheless, a colleague is asking me for the "effective degrees of freedom". As far as I understand, those degrees of freedom have to be estimated for more complex regressions, but I was not able to find detailed information about it. Does any one of you know if I have to estimate those effective degrees of freedom for a simple Pearson correlation test? Thank you very much in advance, -- -mario