Loop

[Michael Massaro]

Hello,

I have a very simple question but I can't find a working solution in the Stata help section.

I have a dataset and I want to draw a graph for all regions of my country.

I managed to get a graph using twoway line var year, sort for the entire country. Now I'd like to do the same thing for each region. The variable region has codes, like 001,A1, R3,... as region identifiers.

I could to that with

preserve
keep if region="A1"
twoway line ....
restore

And repeat this for all region,

However, I was wondering: is there a code to do that more easily?


Thanks a lot!

[Clyde Schechter]

twoway line ..., by(region)

[Michael Massaro]

Thank you so much! I exploit the opportunity for an unrelated follow-up question: doing the above, I get an error when I try to drop some regions, because of type mismatch... my regions are in a format %9s.

How can I drop let's say region 00?

Both
drop if region=="00"
drop if region="0"
do not work...

Thanks!

[Nick Cox]

No; please start a new thread with a different question, and first read https://www.statalist.org/forums/help#stata to find out how to give us a data example.

The only certainty here is that you need == not = to testt for equality. Why == "00" doesn't work is impossible to say without a data example.