On Thu, Jul 8, 2010 at 3:14 PM, Addi Wei <addi...@gmail.com> wrote:
>
> Hopefully simple question: What is the best way to name, and treat factor
> columns for data that has lots of columns?
>
> This is my column list:
> id pID50 D.1 D.2 D.3 D.4 D.5 , etc. all the way to D.185
>
It would be much better to use a factor and let R itself generate the set of
dummy variables.
Choose a useful name. For example if D stands for Dose, then use something
like
micetitletest$Dose <- factor(micetitletest$dose.values)
miceD <- plsr(pID50 ~ Dose, ncomp=10, data = micetitletest)
Read about factors in the online An Introduction to R distributed as part of
R.
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