Re: [R] data manipulation

From: Thomas Lumley <tlumley_at_u.washington.edu>
Date: Fri 09 Sep 2005 - 03:30:34 EST

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@u.washington.edu	University of Washington, Seattle

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https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Fri Sep 09 03:33:39 2005

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