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st: RE: reshape command ---listing all the variables changing over time?


From   "Martin Weiss" <martin.weiss1@gmx.de>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: reshape command ---listing all the variables changing over time?
Date   Thu, 13 May 2010 23:44:57 +0200

<>

***********
ssc d panels
***********

may be helpful to check for constant variables within panels.


What kind of dataset is it that features 1,500 variables that you want to
-reshape- to wide? I would say that this is not a normal situation when
applying the -reshape- command. You will end up with a dataset with slightly
more than 1,500*(number of distinct values of j) variables. Is that really
intended? Stata is fond of the "long" format for most analyses...


HTH
Martin


-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Amanda Fu
Sent: Donnerstag, 13. Mai 2010 21:57
To: statalist@hsphsun2.harvard.edu
Subject: st:reshape command ---listing all the variables changing over time?

Hi all,

I was wondering if anyone could help me with a problem I met when
using --reshape--command.

When I tried to reshape a data set from long version to wide version,
I find I  need to list all the variables that are not constant in the
--reshape--command. Suppose the data set has 1500 variables changing
over time and 100 constant variables.
------------------------------------------------------------
. reshape wide x1-x1500, i(id) j(wave)
------------------------------------------------------------
If I miss any of the variables changing over time, the reshape command
will give error message such as "variable XXXX not constant " and will
stop working.  But it is so frustrating to separate the constant
variables and not-constant variables and list all of the latter ones
in the reshape command.

What I used to do is just to drop all the unnecessary variables from
the data set before reshape to reduce the work load here.

May I know if there is any more efficient way to deal with this problem?

Thanks for your time!

Sincerely,
Mandy
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