Friedman test: Can !?

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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!

• Friedman test: Can !? -

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