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st: do file

From   lydia huang <>
Subject   st: do file
Date   Mon, 8 Mar 2010 18:24:39 +0800 (CST)

Dear Statalist,
is there any thing wrong with the following do-file:
/* sort and save the using data*/
cd H:\my\2007
use written, clear
sort patient_id
save, replace

/* sort the master data*/
use 13, clear
sort patient_id

/* merge based on "patient_id" and save*/
merge patient_id using written
save final07, replace

i don't know why, but all the observations in the final07 have doubled.Why has this happened? what can i do?
Best wishes


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