HTH!
Jim Porzak
Loyalty Matrix Inc.
On 9/8/05, Thomas Lumley <tlumley at u.washington.edu> wrote:
>
> This is what reshape() does.
>
> -thomas
>
> On Thu, 8 Sep 2005, Marc Bernard wrote:
>
> > Dear All,
> >
> > I would be grateful if you can help me. My problem is the following:
> > I have a data set like:
> >
> > ID time X1 X2
> > 1 1 x111 x211
> > 1 2 x112 x212
> > 2 1 x121 x221
> > 2 2 x122 x222
> > 2 3 x123 x223
> >
> > where X1 and X2 are 2 covariates and "time" is the time of observation and ID indicates the cluster.
> >
> > I want to merge the above data by creating a new variable "X" and "type" as follows:
> >
> > ID time X type
> > 1 1 x111 X1
> > 1 2 x112 X1
> > 1 1 x211 X2
> > 1 2 x212 X2
> > 2 1 x121 X1
> > 2 2 x122 X1
> > 2 3 x123 X1
> > 2 1 x221 X2
> > 2 2 x222 X2
> > 2 3 x223 X2
> >
> >
> > Where "type" is a factor variable indicating if the observation is related to X1 or X2...
> >
> > Many thanks in advance,
> >
> > Bernard
> >
> >
> > ---------------------------------
> >
> >
> > [[alternative HTML version deleted]]
> >
> > ______________________________________________
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> >
>
> Thomas Lumley Assoc. Professor, Biostatistics
> tlumley at u.washington.edu University of Washington, Seattle
>
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