Hi

I need to test scores from questionnaires ADDQoL by age group by Kruskal
test. But he wrote me:

kruskal.test (wis1 ~ vekkat)
Error in kruskal.test.default (c (-2, -4, 0, -1, -1, -3, 0, -4, 0, -1, 0,:
all group levels must be finite

Vekkat is as.factor and wis1 is as.nuemric

How to remove this error? Please advise me. Thank you

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