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  1. victorxstc

    Nonparametric alternative to point-biserial correlation coefficient? - Which? t-test or Mann Whitney?

    A. I know from the net that for a design with one binary variable and a second variable that is continuous but is NOT normally distributed, I can use BOTH the point-biserial correlation (which is basically the parametric Pearson correlation formula) as well as the Rank Biserial Correlation...
  2. A

    SPSS Statistics: Significant Differences between follow-up scores independent groups

    Hi, I have collected data on scores for a sample population before, 1 year after and 6 years after an intervention. All participants in the sample received the intervention. However, participants required the intervention for different reasons. I want to find out whether there is a...