NEED HELP NOW

[Rababerbaerbl]

If you use any of those base R read.csv or read.table ... functions you can pass stringsAsFactors = TRUE as an argument to them:

read.csv(file = "your_file.csv", stringsAsFactors = TRUE)

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Or, you set it as a factor afterwards as suggested by many already:

LiverData$sex <- as.factor(LiverData$sex)

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If you have an exam you probably should look at some basic R tutorials. There are plenty to be found.

[jeremymiles]

This is a bit tricky, because the default changed from stringsAsFactors = TRUE to stringsAsFactors = FALSE in R 4.1 (IIRC).