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st: Using foreach and forval to append data files


From   Tim Evans <Tim.Evans@wmciu.nhs.uk>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   st: Using foreach and forval to append data files
Date   Tue, 26 Mar 2013 12:07:19 +0000

Dear all,

Using Stata 11.2, I've created 18 individual results sets that have the following naming schedule:

1_1_results.dta
1_2_results.dta
1_8_results.dta
2_1_results.dta
2_2_results.dta
2_8_results.dta
3_1_results.dta
3_2_results.dta
3_8_results.dta

This continues until the first number reaches 6. 

What I am trying to achieve is an automated process of appending all data files and I was using the following code - but this adds a duplication of the file 1_1_results:

use 1_1_results.dta, replace
forval i = 1/6 {
foreach j of numlist 1 2 8 {
append using `i'_`j'_results
}
}

I then tried this:

use 1_1_results.dta, replace
forval i = 2/6 {
foreach j of numlist 1 2 8 {
append using `i'_`j'_results
}
}

Which I then realised that I miss out on any file named:

1_2_***
1_8_***

Other than using the first loop and using -duplicates- to identify and then remove the duplicates, is there a more direct way of using and then appending datasets?

Best wishes

Tim


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