Help : create a variable with the frequency + need options

[olivier msl]

Hello everybody !

Here are the two variables I use: Assignment (DS01, DS02 ...) and Default (dummy). The latter is my explained variable.

I want to create a variable representing the default frequency == 1 depending on my assignment. I made this command:
egen x = count (1), by (Assignment)
This gives me the frequency of observations in each district. I want the same thing but only for default == 1.
What options can I add?


Pleaaaase Help

[Nick Cox]

The question does not refer to Mata and appears to be a variation on https://www.statalist.org/forums/for...other-variable