Friedman’s test with tied data

I completely sympathise with students sometimes when they say they hate statistics. I really do. A colleague emailed me the other day in response to a student query regarding difficulty in getting their hand-calculation for a Friedman test to match that produced by SPSS (shout-out to this eagle-eyed student!!). I smiled to myself, thinking "silly SPSS, …

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Response Time Modelling – How Many Trials?

Over the past year I have become increasingly interested in using models of simple decision making processes, as measured by two-choice response time tasks. A simple 2-choice task might ask participants to judge whether a presented number is odd or even, for example. One popular model of 2-choice RT is the Ratcliff Diffusion Model. A …

New blog – so what?

I was hesitant to start a personal blog about my academic interests. There are so many excellent psychology-related bloggers out there (Rolf Zwaan's and Dorothy Bishop's are among my faves); who am I to say anything of interest to potential readers when they could be reading those blogs? But then I thought, why not just …