Dear Rachele,
please take a look at what follows (assuming that you are comparing two
periods and that the population at risk of hospitalization for each period
is made up of 500 individuals):
---------begin example------------------------
set obs 10000
g id=_n
g period=1 in 1/500
replace period=2 in 501/1000
g year=1
g Hosp=1 in 1/150
replace Hosp=0 in 151/500
replace Hosp=1 in 501/700
replace Hosp=0 in 701/1000
g Risk_time=1-0
stset Risk_time, id(id) failure(Hosp==1) scale(1)
sts test period, logrank
---------end of example------------------------
Another choice may be to use -irr-
HTH and Kind Regards,
Carlo
-----Messaggio originale-----
Da: [email protected]
[mailto:[email protected]] Per conto di Rachele Capocchi
Inviato: mercoled� 4 giugno 2008 11.54
A: [email protected]
Oggetto: st: growth rate
Dear Statalisters,
I have to do a trend analysis on the hospitalization rates in 5 years,
between 2001 and 2005. I have the absolute numbers of hospitalization,
the population of all years and I calculated the hospitalization rates
yearly.
I need to calculate the CI for the growth rate (ex. 12,5% - 13,5% growth
rate from 2001 to 2005) and the p value.
Which test I have to do ?
Thanks a lot,
Rachele
Rachele Capocchi
Agenzia Regionale Sanit� Toscana
"U.O. Centro Statistico Elaborazione Dati"
Sede Operativa - viale Milton,7
50134 Firenze
Tel. 055-4624354
Fax. 055-4624345
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