[R] Translation of R code required

Sarah Goslee sarah.goslee at gmail.com
Fri Nov 3 19:12:19 CET 2006

On 11/3/06, Sarah White <swhite at sgul.ac.uk> wrote:
> I am using Windows XP, R version 2.4.
> The code works until I get to the fourth line starting
> model.effect
> and I receive the following Error message.
> Error in eval(expr, envir, enclos) : object "Centre" not found

It sounds like the variable names aren't what you think they are.
Try this:

mental <- read.csv("dataextract.csv")

If the names don't match exactly, R won't know what you mean.

Since this step works,

mental$Rx <- factor(mental$Rx, levels=c("VS","IPS"))

I think that some of the names are right, but perhaps that
one is spelled differently (Centre vs centre, maybe, since
R is case-sensitive?).

The easiest thing to do with no R knowledge is probably
to change the name in the csv file to match your code,
if that turns out to be the problem.


Sarah Goslee

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