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...undefined columns selected It seems if a logical variable is created, and the subsetting on a factor variable won't work directly.(It works directly for numeric variables) Can anyone help please. Regards Hennie Gerber Hennie Gerber Statistician UNISA - Research Support + 27 12 429 3188 Waarskuwing! Die sienings uitgespreek is my eie en nie noodwendig my werkgewer sin nie Warning! All views expressed are my own and not necessarily that of my employer. --------------------------------------------------------------------------- This message (and attachments) is subject to restricti...

...ted automatically, because the data is coded numerically. To make factors out of the 50 questions I must do: V1 <- factor(V1) I don't want to do it 50 times. Is there a quicker way without using loops? Thanks Hennie Hennie Gerber Statistician UNISA - Research Support + 27 12 429 3188 Waarskuwing! Die sienings uitgespreek is my eie en nie noodwendig my werkgewer sin nie Warning! All views expressed are my own and not necessarily that of my employer. --------------------------------------------------------------------------- This message (and attachments) is subject to restricti...