Keeping Certain Value of a Variable

[Tess Gecha]

I have a variable named "group" with values "Healthy MSCAD," "MSAD," and "BPD MSCAD." Next to type, it says byte. I would like to only keep the "BPD MSCAD" values. How would I do that? I tried the following code and it did not work:

keep if group=="BPD MSCAD"

[Carlo Lazzaro]

Tess:
you seem to have a categorical variable with different (labelled) levels.
Please note that -label- assigns names to numbers, but numbers still rule!
Youmay want to consider the following toy-example:

. use "C:\Program Files\Stata17\ado\base\a\auto.dta"
(1978 automobile data)

. g rep78_bis=rep78
(5 missing values generated)

. keep if rep78_bis==4
(56 observations deleted)

.