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st: How to keep if freq of var is >= 100 for both group (Alcohol "1" and non-alcohol "0")?
From
Caliph Omar Moumin <[email protected]>
To
"[email protected]" <[email protected]>
Subject
st: How to keep if freq of var is >= 100 for both group (Alcohol "1" and non-alcohol "0")?
Date
Mon, 24 Sep 2012 23:53:21 -0700 (PDT)
Dear stata-helpers
I have a large dataset which more than 500,000 observations; and more than 7000 diagnoses, which is grouped into two groups alcohol coded as "1" and nonlacloh as "0"
the data structure is like this
obs id diagnosis group............other variables
1 2338 A120 1
2 3838 m23 0
.
.
.
.
500,000 45566 y678 1
So i want to keep if observations is >= 100 for both groups alcohol and nonalcohol based on daignoses. For example if daignoses A120 has more than 100 observations for both alcohol and nonalcohol keep if not drop it.
I would appreciate if any could help
Kind Regards,
Caliph
Email: [email protected]
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