From R 3.0.0 onwards `mean(<data.frame>)`

is defunct (and passing a data.frame to `mean`

will give the error you state)

A data frame is a list of variables of the same number of rows with unique row names, given class “data.frame”.

In your case, result has two variables (if your description is correct) . You could obtain the column means by using any of the following

lapply(results, mean, na.rm = TRUE) sapply(results, mean, na.rm = TRUE) colMeans(results, na.rm = TRUE)

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