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st: re: Creating number of days per month


From   Kit Baum <baum@bc.edu>
To   statalist@hsphsun2.harvard.edu
Subject   st: re: Creating number of days per month
Date   Mon, 2 Nov 2009 11:06:29 -0500

<.>
It was suggested that the long format makes this easy: to compute how many days in each calendar month the patient was in the facility. Indeed so:

clear
inp str10(var1 var2)
"30nov2007"   "14feb2008"
"21jan2009"   "07apr2009"
"24apr2008"   "09jul2008"
"22feb2008"   "08may2008"
"01oct2008"   "16dec2008"
"13jul2009"   "28sep2009"
"04oct2008"   "20dec2008"
"07jul2009"   "22sep2009"
"03jun2008"   "19aug2008"
"11feb2009"   "30apr2009"
"31mar2007"   "17jun2007"
"01may2007"   "19jul2007"
"04apr2007"   "22jun2007"
"03jul2008"   "20sep2008"
"10jul2007"   "27sep2007"
end

gen date1=date(var1, "DMY")
gen date2=date(var2, "DMY")
drop var1 var2
g patientid = _n
reshape long date, i(patientid)
tsset patientid date
format date %td
l, sepby(patientid)
tsfill
g mon = mofd(date)
g days = 1
collapse (count) days, by(patientid mon)
format mon %tm
l patientid mon days, sepby(patientid)



Kit Baum   |   Boston College Economics & DIW Berlin   |   http://ideas.repec.org/e/pba1.html
An Introduction to Stata Programming | http://www.stata-press.com/books/isp.html
   An Introduction to Modern Econometrics Using Stata  |   http://www.stata-press.com/books/imeus.html

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