Dear Mike, your contrast will give exactly the same results. Best, Christian On Thu, 1 Jun 2017 12:00:42 +0100, Mike <[log in to unmask]> wrote: >Dear Christian, > >Thanks for your response. >For a contrast of the F-test to test whether there are differences between the correlations of the 3 groups, can I use the one below? > > > 0 0 0 1 -1 0 > 0 0 0 0 1 -1 > 0 0 0 1 0 -1 > > >Best, > >Mike