Solved – How to apply Wilcoxon test to small sample with NAs

missing datasmall-samplewilcoxon-signed-rank

I have the following data which show some values before and after a drug. I want to test whether the drug increased the mean. I think I should use Wilcoxon test, but I don't know what to do with missing values (NAs). Do I need to remove NAs and corresponding before values?

before after
2.2    NA
8.2    5.2
9.5    NA
10.5   4
12.5   6
10.5   3
9.7   10
11.5   NA

Best Answer

I think you should remove the data with NA though the data set is already very small, i don't believe you can make an inference and hypotize some values if you are studying the drug for the first time.

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