How can I multiply two category variables by another category variable to create a new variable?

[Hm Saleh]

Hi All,

I want to create a new variable which is (Age * Education levels). But the problem is that the age variable and education levels variable are categories, for example, the 'Age variable' has five age groups and the 'education levels variable' has five levels of education.
How can I multiply two category variables by another category variable to create a new variable?

Thanks,

[Carlo Lazzaro]

Hm:
I'd be way better off with letting Stata -fvvarlist- notation do it for you (I assume you're interested in creating a predictor for a regression):

i.age##i.education_levels

The usual cautionary tale about categorizing a continuous predictor (https://pubmed.ncbi.nlm.nih.gov/16217841) still holds.