You must be sure to combine the data and real errors from stata. Stata has very good information following merge. Steps Are : 1 export each file to dta type 2 decide which if the 7 is the Main 3. Use Main 4 add the one at the time Merge 1:1 id using file2 Etc file3.... File7 If you have more than one record per id in s subtile use 1:n or n:1. Read the stata manuals on that.

Never combine files by sequence always by merge on one or more id variables.

Regards Jens Lauritsen

epidata-list@lists.umanitoba.ca skrev:

My problem is hard to describe - of course. ;)

I have 7 formulars with EpiData. There is a ID-field in each of it. After exporting them to Stata-files it is important that the order of the data rows fits to the other Stata-files. For example ID "X77" should appear in each 7 data sets in the same row.

But it doesn't. Sometimes there are errors in it. Now I want to figure out, how this can happen? Does it happen if I reedit an entry or something like that. Do you have an idea?

Christian Buhtz _______________________________________________ EpiData-list mailing list EpiData-list@lists.umanitoba.ca http://lists.umanitoba.ca/mailman/listinfo/epidata-list