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I am trying to do an unpaired wilcoxon (Mann Whitney test) with a df containing gene expression values for two samples

  SampleA SampleA SampleA SampleB SampleB

gene1 gene2 gene3 .. ..'

I have grouped the two sample types into SampleA and SampleB and using the following code to do a Wilcoxon test:

wilcox.test(df$tissueA, df$tissueB, paired=FALSE)

Error in wilcox.test.default(df$tissueA, df$tissueB, paired = FALSE) : 'x' must be numeric

Hector2018
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  • Does this answer your question? https://stackoverflow.com/questions/68931518/apply-statistical-test-to-many-variables-improve-speed – jared_mamrot Nov 26 '21 at 03:29
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    The error is pretty clear. The first argument is `x=` and you provided `df$tissueA`. The error message says that `df$tissueA` is not a numeric variable. Is it? Since you did not provide a reproducible example, we cannot possibly know. – dcarlson Nov 26 '21 at 04:52

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