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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