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Re: st: Save the percentage of each response category into new variables


From   Bryan Sayer <bsayer@chrr.osu.edu>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Save the percentage of each response category into new variables
Date   Fri, 09 Sep 2011 15:42:02 -0400

While it is true that the mean of a 0/1 variable is equal to the proportion, the confidence interval obtained this way may go below zero or above one, which is generally an undesirable characteristic.

Some software will use a logit transformation to prevent this, but only when doing confidence intervals of actual percentages.

Bryan Sayer
Monday to Friday, 8:30 to 5:00
Phone: (614) 442-7369
FAX:  (614) 442-7329
BSayer@chrr.osu.edu


On 9/9/2011 3:32 PM, hsiyuan@uchicago.edu wrote:
Yeah you are right, proportion is simply the mean of a dummy/indicator variable. That's all I need.

I'll simply run the following then:

tab marstat, gen(marital)
collapse (mean) marital1-marital5, by (group time)

Thanks both!

Hsi-Yuan Chen
University of Chicago
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