I am analyzing an experiment in which time is a factor, represented by
numbers indicating time since last treatment, but in this particular case
there is no reason to think that time has a numeric meaning in the sense
that 24 would be greater than 6. We have no idea which genes will be
increasing or decreasing at different times.
So I have the following model (to be applied over many genes):
mod <- lm(gene.expression ~ Treatment + Time)
If I wanted to just hack my way around this I could just paste a character
to all of the times, but I'm curious as to the right way to do this.
What would be the correct syntax or transformation? Would Time <-
factor(as.character(Time)) do it? I want to make sure that it does not get
coerced back to numeric.
Thanks,
Mark
Mark W. Kimpel MD ** Neuroinformatics ** Dept. of Psychiatry
Indiana University School of Medicine
15032 Hunter Court, Westfield, IN 46074
(317) 490-5129 Work, & Mobile & VoiceMail
(317) 399-1219 Skype No Voicemail please
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