st: AW: dropping values

["Martin Weiss" <martin.weiss1@gmx.de>]

<> 

Just wrap the thing in the -float()- function:

*************
clear*

inp so2conc
0 
.2 
.25 
.3 
.4 
.5 
.6
1.0
end

drop if so2conc==0.2
drop if so2conc==float(0.2)
*************

See http://www.stata.com/support/faqs/data/float.html



HTH
Martin

-----Ursprüngliche Nachricht-----
Von: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von
Svendsgaard.David@epamail.epa.gov
Gesendet: Dienstag, 8. Juni 2010 16:24
An: statalist@hsphsun2.harvard.edu
Betreff: st: dropping values

I think there is a problem with dropping values of a variable.

I have a variable named so2conc and it has values 0 .2 .25 .3 .4 .5 .6
1.0
If I use
drop if so2conc==0.2
nothing gets dropped.

If I use
egen so2=group(so2conc)
and then
drop if so2==2
then I get dropped what I need dropped.
I think the problem is that so2conc is stored as a real value.

Has anyone else had this problem or is there something written about
avoiding this problem?

Thanks,

Dave

David J Svendsgaard, PhD
Biostatistician
EPA/ORD/NCEA/RTP, Mail Drop B-243-01
Research Triangle Park, NC 27711
Phone (919) 541-4186
Fax (919) 541-1818

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