I am getting same value for mean score and proportion, is that okay or I am doing wrong

[Tania Nasrin]

I am using the command
by study_sample, sort: ci proportions epds_category_1 if part_agree==0
by study_sample, sort: ci mean epds_category_1 if part_agree==0

My question is that when do we get the same value for proportion and mean?

[Carlo Lazzaro]

Tania:
that's correct, as the proportion is basically the mean of 0s and 1s.

use "C:\Program Files\Stata17\ado\base\a\auto.dta"

. ci proportion foreign

                                                            Binomial exact  
    Variable |        Obs  Proportion    Std. err.       [95% conf. interval]
-------------+---------------------------------------------------------------
     foreign |         74    .2972973    .0531331         .196584    .4148353

. ci mean foreign

    Variable |        Obs        Mean    Std. err.       [95% conf. interval]
-------------+---------------------------------------------------------------
     foreign |         74    .2972973    .0534958        .1906803    .4039143

.

[Tania Nasrin]

Thanks a million.