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st: AW: re: Creating number of days per month

From   "Martin Weiss" <[email protected]>
To   <[email protected]>
Subject   st: AW: re: Creating number of days per month
Date   Mon, 2 Nov 2009 17:13:41 +0100


Just wondering: Would the -tsfill- line (which adds observations for every
single day spent by every single patient in the dataset) lead to memory
problems at some point, given that Rajaram said that sample members spent
two years there in some cases?


-----Ursprüngliche Nachricht-----
Von: [email protected]
[mailto:[email protected]] Im Auftrag von Kit Baum
Gesendet: Montag, 2. November 2009 17:06
An: [email protected]
Betreff: st: re: Creating number of days per month

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:

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"

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)
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   |
                               An Introduction to Stata Programming   
    An Introduction to Modern Econometrics Using Stata  |

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