Posted by **Colin** on Thursday, August 13, 2009 at 5:22am.

I have 28 participants. Each completed five tests. The maximum score a participant could receive on any one test was 4/4. The lowest score anyone could receive was zero.

I will do a Friedman test for this paired data.

My question: given that I have a very large number of identical ranks (mostly participants getting zero in all tests) can I still go ahead? I just want to know if there is a significant difference in the medians.

Thanks!

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