Hi,
`stats::chisq.test` checks that x and y each have at least 2 levels AFTER
filtering on complete cases.
It makes sense but the error message is misleading : “'x' and 'y' must have
at least 2 levels”
Here’s how to reproduce the issue :
x <- structure(c(1L, 1L, 1L, 2L, 1L, 2L), .Label = c("0001", "0003"),
class = "factor")
y <- structure(c(1L, 2L, 2L, NA, 2L, NA), .Label = c("0001", "0002"),
class = "factor")
chisq.test(x,y)
# Error in chisq.test(...) : 'x' and 'y' must have at least 2 levels
In this case they do have 2 levels.
Best regards,
Antoine
>
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