Categorical Variables

[Kira Mitz]

Hi, I'm an ultra-beginner to Stata and everything related to it. Nevertheless, I have to fix this problem.
I work on a large-scale assessment with 42,000 values. have 5 self-concept variables, one for each subject (eg: sskmat, sskdeu) and 5 grade variables, one for each subject (eg: tnotemat, tnotedeu) each with 6 grade characteristics (1 is bad; 6 very good) and the dummy variable female.

I basically in the first step just need two grade groups (German&Math High group and one Mathhigh group) and their respective self-concept mean for female and non-female. I z-standardized the variables as well but didn’t use it for this analysis so far, cause I needed the “real” grades (due to a lack of skills).

So far I managed it this way, but it’s not really convenient. I would also need a Cohen’s d (I guess?)

Mean sskmat if tnotemat>=5 & tnotedeu ==4 & female

Mean sskmat tnotemat>=5 & tnotedeu >=5 & female

How can I do this properly?

Thanks a million!!!

[Carlo Lazzaro]

Kira:
welcome to this forum.
The substantive part of your post is missing.

[Carlo Lazzaro]

Kira:
as per your codes, you're calculating the -mean- (+ standard error and 95% CI) of the two variables imposing some conditions via an -if- qualifier.
Remarkably, your last condition should be somethng like:

& female==0

or

& female==1

Be sure that you want -mean- (an inferential command) and you're not interested in descriptive statistics that you can obtain via -summarize- or -tabstat-.
In addition, -search cohend- will take you to the instructions needed to install the community-contributed module you may be interested in.