[R] Ordering in factors ...

[j.logsdon@lancaster.ac.uk]

This is a trivial question probably buried in page 21 somewhere of An
Idiot's Guide to R.

In MASS(2) P26 for S-Plus you can write:

ordered(income)<-c("Lo","Mid","Hi")

but in R 1.5.0 you get the response to such an instruction:

Error: couldn't find function "ordered<-"

What's the fix to this?  I have a series of models where the factors as
reported need re-ordering so that the glm reports the coefficients with
respect to the correct level.  At the moment, while the solutions are
identical, I actually have to do some arithmetic to show this.

TIA

John

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