[R] reshape package does not recognize second id variable
h.wickham at gmail.com
Mon Sep 29 02:55:53 CEST 2008
On Sun, Sep 28, 2008 at 6:45 PM, Keith Schnakenberg
<keith.schnakenberg at gmail.com> wrote:
> I am trying to use the reshape package for the first time. I have two waves
> of a survey, so the id variables include a subject identification number and
> a variable denoting the wave of the survey.
> I used the following arguments:
> svy.melt <- melt(svy, id=c("id", "WAVE"))
> svy.wide <- cast(svy.melt, id ~ WAVE + ...)
> and got the following error:
> "Error in check_formula(formula, varnames) :
> Formula contains variables not in list of known variables"
> I check to make sure variable name is right, and it is:
> Min. 1st Qu. Median Mean 3rd Qu. Max.
> 1.00 1.00 1.00 1.47 2.00 2.00
What does the output of str(svy) and str(svy.melt) look like?
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