Dear all,
I am doing a survival analysis on mutiple events, the data is split into 3 months interval. Once the data is split, I would like to assing each 3 months a date the measurements of liver funtion is been taken that lies between the interval and if it has two measurements within each interval to take the first.
this is the command I am running in STATA 10
stset exitdate, f(ckd) origin(time datefirstseen) enter(time datefirstseen) exit(time .) id (id) scale (30.45)
recast float _t _t0, force
gen y= _t- _t0
labe var y "follow-up time in months*/
format _origin %d
stsplit time, every(3)
sort id
merge id using `livf' /*then merge with serial measurments data*/
quietly forval i = 1/`= _N' {
sort id exitdate datelliv ///
inrange((starf[`i']) (starf[`i'[_n-1]]), - Date, 1, 232009)
gen flag = r(N) in `i'
}
STATA comes back with "time-series operators not allowed"
I wnted to genrate the flag to indicate the date between 17/02/06 and 19/05/06, which is 01/03/2006. Not sure what I am doing wrong, please could nay one help.
thanks very much
Kind Regards
id
exitdate
dateliv
111
17-Feb-06
01-May-08
111
19-May-06
21-Nov-05
111
18-Aug-06
12-Jan-06
111
17-Nov-06
17-May-06
111
16-Feb-07
16-Aug-06
111
18-May-07
01-Mar-06
111
17-Aug-07
06-Feb-07
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