st: counting and eliminating data

[Jennifer Devine <jdevine@mun.ca>]

Can someone please set me in the right direction for coding a program to 
count and eliminate data if it doesn't meet a certain criteria?

 I have survey data taken over 26 years and the survey area is divided 
into subareas. I want to only include a subarea if data was collected 13 
years out of the 26 and data must have been collected 2 years of the first 
5 years and 2 years of the last 5 years. If the subarea does not meet that 
criteria, I want Stata to drop that subarea from the analysis. At the 
moment, I'm having to look at everything individually and it takes several 
days to eliminate subareas.

Thank you,
Jennifer



Jennifer Devine
Doctoral Candidate
Memorial University of Newfoundland
St. John's, NL A1C 5S7
Canada
Tel: (709) 737-8833
Fax: (709) 737-3121

email: jdevine@mun.ca 
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