Hello. Could anyone help me figure out why the two commands below end up differently? Each row of my dataset corresponds to a delivery in a given health facility. The variable tp_par indicates the type of delivery. I would like to collapse my dataset aiming for a variable with the sum of all deliveries of type 5 by health facility.
1st code
2nd code
1st code
Code:
. use SINASC_12a13_all, clear
. keep if tp_par==5
(3598297 observations deleted)
. gen um=1
. collapse (sum) npar_semtp=um, by(cnes)
. su npar_semtp
Variable | Obs Mean Std. Dev. Min Max
-------------+--------------------------------------------------------
npar_semtp | 1880 715.2697 1237.922 1 26083
2nd code
Code:
. use SINASC_12a13_all, clear
. gen npar_semtp = (tp_par==5)
. replace npar_semtp=. if tp_par==.
(574065 real changes made, 574065 to missing)
. collapse (sum) npar_semtp, by(cnes)
. su npar_semtp
Variable | Obs Mean Std. Dev. Min Max
-------------+--------------------------------------------------------
npar_semtp | 1894 709.9826 1234.857 0 26083