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Re: st: dropped observations after append


From   Maarten buis <maartenbuis@yahoo.co.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: dropped observations after append
Date   Mon, 20 Mar 2006 00:42:44 +0000 (GMT)

Michael:
Is the variable dset in dset1.dta a string? (open dset1.dta and type -desc dset- to find out)
HTH,
Maarten

--- Michael McCulloch <mm@pinest.org> wrote:

> I have two datasets, (dset1.dta and dset2.dta).
> With dset1.dta, I append with the command: append using dset2.dta.
> 
> dset1.dta has:
> id      dset    agev    male    meduse  afev1
> 2       1       10      1       1       1.700833
> 6       1       11      0       0       2.084792
> 15      1       11      1       0       1.499583
> 18      1       7       1       0       1.183437
> 20      1       10      1       0       1.400417
> 
> dset2.dta has:
> id      dset    agev    male    meduse  afev1
> 2       0       10      1       0       -9
> 6       0       11      0       1       -9
> 15      0       11      1       1       -9
> 18      0       7       1       1       -9
> 20      0       10      1       1       -9
> 
> After I append, why are values from the first dataset dset1.dta for the 
> variable dset==1 are dropped?
> id      dset    wheeze  cough   meduse  afev1   male    agev    height 
> anysx
> 2       0       0       0       0       -9      1       10      137.922 
> 0
> 2       .       0       0       1       1.700833        1       10 
> 137.922 0
> 6       .       0       1       0       2.084792        0       11 
> 150.876 1
> 6       0       0       1       1       -9      0       11      150.876 
> 1
> 15      .       0       1       0       1.499583        1       11 
> 141.986 1
> 15      0       0       1       1       -9      1       11      141.986 
> 1
> 18      .       0       0       0       1.183437        1       7 
> 120.396 0
> 18      0       0       0       1       -9      1       7       120.396 
> 0
> 20      .       0       0       0       1.400417        1       10 
> 150.114 0
> 20      0       0       0       1       -9      1       10      150.114 0
> 
> 
> 
> 
> Best wishes,
> Michael
> 
> 
> ____________________________________
> 
> Michael McCulloch
> Pine Street Clinic
> 124 Pine Street, San Anselmo, CA 94960-2674
> tel     415.407.1357
> fax     415.485.1065
> email:  mm@pinest.org
> web:    www.pinest.org
>          www.pinestreetfoundation.org
> 
> 
> 
> 
> 
> *
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> 


-----------------------------------------
between 1/2/2006 and 31/3/2006 I will be
visiting the UCLA, during this time the
best way to reach me is by email

Maarten L. Buis
Department of Social Research Methodology
Vrije Universiteit Amsterdam
Boelelaan 1081
1081 HV Amsterdam
The Netherlands

visiting adress:
Buitenveldertselaan 3 (Metropolitan), room Z214

+31 20 5986715

http://home.fsw.vu.nl/m.buis/
-----------------------------------------


		
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