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Re: st: frustrated by missing variables--collapase and merge


From   "Ronnie Babigumira" <ronnie.babigumira@umb.no>
To   <statalist@hsphsun2.harvard.edu>
Subject   Re: st: frustrated by missing variables--collapase and merge
Date   Fri, 18 Mar 2005 09:39:59 +0100

Zhou
I may be off the mark here but I dont see the problem.

Say you have x1 x2 x3 x4 as your variables. when u collapse x2 by x4
then you will be left with only x2 and x4 (and the structure of x2 will
change to reflect the collapse operation e.g mean).

About merging, Im not sure why any variables would disappear. Say you
had 2 data sets

dataset 1
x1 x2 x3

dataset 2
x1 x4 x5

if you merge these twodatasets (notice both have x1 so the merge would
be by x1) then the resulting dataset will have all the variables as well
as an additional one _merge

combined (merged)
x1 x2 x3 x4 x5 _merge


Ronnie


>>> zyu@usc.edu 03/18/05 4:24 am >>>
Hi all,

I have been trying to collapse merge a number of variables. What
frustrated me is that there is always one or two variables missing
after
collapsing or merging. Last night I have to repeated the same
procedures
several times, which took me the whole evening to create a dataset.
Intestingly, each time, different variables were missing.

Have anyone encountered the same problem? Any solutions?

Thanks a bunch!

Zhou

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