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st: merging two datasets of long format


From   "Raquel Guimaraes" <raquelrguimadem@gmail.com>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: merging two datasets of long format
Date   Thu, 19 Apr 2012 19:39:46 -0700

Hi everyone,

I have two datasets in the long format:

Students -- identifiers: id1 (student-specific), id2, id3, id4
Teachers -- identifiers: id2, id3, id4, id5(teacher-specific)

I want to merge students to teachers using id2, id3 and id4. The two
datasets above are in long format, and "time" is the time variable.

When  I do the merge after sorting the variables:

use "$directory\clean\students", clear
sort id2 id3 id4
merge m:1 id2 id3 id4 "$directory\clean\teachers" 

I got the following error: "factor variables and time-series operators not
allowed"

Any help will be appreciated!

Thanks,

Raquel





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