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st: sum: collapse vs egen


From   ciccarec@uniroma2.it
To   statalist@hsphsun2.harvard.edu
Subject   st: sum: collapse vs egen
Date   Sat, 05 Sep 2009 14:15:08 +0200

Hello,
   Here is my code:

clear
version 9.2
set obs 1
gen double a=3.86
save data1,replace

clear
set obs 1
gen double a=4.895
save data2,replace

use data1,clear
append using data2
egen sum=sum(a)
gen double r1=round(sum*100)/100
list
collapse (sum) a
gen double r2=round(a*100)/100
list

Why are r1 and r2 not equal ?

Thank you,
Carlo

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