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st: RE: cond(x,a,b,c) function


From   "David Harrison" <david.harrison@icnarc.org>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: cond(x,a,b,c) function
Date   Fri, 15 Apr 2005 08:57:12 +0100

The logical expression -rep78==1- is never missing, if rep78 is missing then the expression is false (0) and -cond()- returns 0.

Hope this helps

David

-----Original Message-----
From: James Cui [mailto:james.cui@med.monash.edu.au]
Sent: 15 April 2005 03:33
To: statalist@hsphsun2.harvard.edu
Subject: st: cond(x,a,b,c) function


Dear all:

When I use the cond(x,a,b,c) function, I could not generate the value c 
when x is missing. For example:

sysuse auto, clear
tab rep78, mi
gen a=cond(rep78==1, 1, 0, .)
tab a, mi

It gives

a	Freq.	Percent	Cum.
			
0	72	97.30	97.30
1	2	2.70	100.00
			
Total	74	100.00

There should be 5 missing values for variable a according to the manual. 
Thanks for your input.

James.


-- 
James Cui, PhD MMed BSc (Stats)
Senior Research Fellow
Department of Epidemiology & Preventive Medicine
Monash University
Alfred Hospital, 89 Commercial Road
Melbourne, Victoria 3004
Australia
Tel: 990 30570
Fax: 990 30556
Email: James.Cui@med.monash.edu.au




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