Dear Statalisters--
I have been using -for- for a very long time now, and like it's
capabilities. However, I know it has its limits, and doesn't with a very
complicated sequence of commands.
I recently read Nick Cox' wonderful "Speaking Stata" column, and decided to
try and use -foreach- -forval-, instead of -for-. I have run into problems
with -forval-.
When my numlist is of the form "1 0", "0 1", "1", -forval- complains about
"invalid syntax". It works with "0/1" or "1(-1)0". With "1/0" it doesn't
complain, but displays no results.
-for-, on the other hand, works with all of the above.
Here is the small dataset I was using:
. input fail coag bleed pop
fail coag bleed pop
1. 0 0 0 1403
2. 0 0 1 2
3. 0 1 0 191
4. 0 1 1 1
5. 1 0 0 384
6. 1 0 1 8
7. 1 1 0 241
8. 1 1 1 22
9. end
And here are the problematic commands:
. forval v = 1/0 {tab fail coag [fw=pop] if bleed==`v'}
. capture noi forval v = 1 0 {tab fail coag [fw=pop] if bleed==`v'}
invalid syntax
. capture noi forval v = 0 1 {tab fail coag [fw=pop] if bleed==`v'}
invalid syntax
. capture noi forval v = 1 {tab fail coag [fw=pop] if bleed==`v'}
invalid syntax
Is this a "bug", a "feature", or am I missing something here?
Thanks for your help,
--Estie Hudes
Estie Sid Hudes, PhD MPH
University of California
Prevention Sciences Group &
Center for AIDS Prevention Studies
74 New Montgomery Street, Suite 600
S.F. CA 94105
phone: 415.597.9126
fax: 415.597.9194
email: [email protected]
Web: http://www.epibiostat.ucsf.edu/capsweb/people/hudesbio.html
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