On Aug 12, 2010, at 9:00 PM, elaine kuo wrote:
Dear list, factor function was tried but failed. Pls kindly help and thank you. E. code rm(list=ls()) library(faraway) data (pima) pima$test < - factor (pima$test)
There is a space between your "<" and your "-". R is interppreting that as "make a numerical comparison between pima$test on the lhs and minus factor(pima$test) on the rhs and quite sensibly saying you have given it a nonsensical task.
> pima$test <- factor (pima$test) > str(pima$test) Factor w/ 2 levels "0","1": 2 1 2 1 2 1 2 1 2 2 ... '
[1] NA NA NA NA NA NA
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