Options for -proportion- command

[paulvonhippel]

The following commands a point estimate and confidence interval for the proportion of US women who were unionized in 1988.

sysuse nlsw88, clear
proportion union

By default the command gives a logit confidence interval. To get a normal confidence interval, I type

proportion union, normal

but this returns an error

option normal not allowed

I get similar errors from any of the following variants:

proportion union, logit
proportion union, wald

What am I not understanding about the command? Thanks!

[Rich Goldstein]

not sure if this is a version problem, but the option in the current version of Stata is actually "citype()" where you put wald, etc., inside the parens; here is an example:

. sysuse auto
(1978 automobile data)
r; t=0.03 9:03:20

. proportion foreign, citype(wald)

Proportion estimation                       Number of obs = 74

--------------------------------------------------------------
             |                                   Normal
             | Proportion   Std. err.     [95% conf. interval]
-------------+------------------------------------------------
     foreign |
   Domestic  |   .7027027   .0531331      .5968085    .8085969
    Foreign  |   .2972973   .0531331      .1914031    .4031915
--------------------------------------------------------------