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Re: st: simulating data for logistic regression: translating R toStata


From   Michael McCulloch <mm@pinest.org>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: simulating data for logistic regression: translating R toStata
Date   Tue, 3 Jun 2008 13:11:04 -0700

Thank you Maarten for your previous help.

For the command below which creates a variable with mean 200 and sd==25,
gen chol = 200+25 * invnorm(uniform())

what does the "invnorm(uniform()))" do?
I know the uniform() draws a random number with mean 0 and sd==1, but what about the "invnorm" part?
Michael



--- Michael McCulloch <mm@pinest.org> wrote:
 I'm simulating data for logistic regression (code for variable
 generation is below) , and am missing the last step, linking
 exposureto disease. Disease will be a y/n variable.
This was discussed in M.L. Buis (2007) "Stata tip 48: Discrete uses for
uniform()" The Stata Journal, Vol. 7 No. 3, pp. 434-435.
http://home.fsw.vu.nl/m.buis/wp/discrete.html

Hope this helps,
Maarten

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

visiting address:
Buitenveldertselaan 3 (Metropolitan), room Z434

+31 20 5986715

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


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