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st: RE: RE: survival data analysis- recode survival time variable


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: RE: survival data analysis- recode survival time variable
Date   Tue, 25 Aug 2009 14:12:35 +0100

Juan Miguel gave good advice. 

This is just to note that the code here can be telescoped. 

gen time_in_month = 12 * real(substr(varname, 1, 2)) +
real(substr(varname, 3, 2)) 

Either way, checking that time_in_month is not missing and all sensible
is a good idea. 

Nick 
n.j.cox@durham.ac.uk 

Villa Lora, Juan Miguel

I can see you are handling with a string variable. You might divide this
variable into two differents variables containing years and months and
multiply 12 times years thereafter:

gen year = substr(varname, 1, 2)
gen month = substr(varname, 3, 2)

destring year month, replace

gen time_in_month = (year*12) + month

See help subtr for more details.

Johannes Schoder

I am working with survival data and have the problem that my variable
survival time is in the following format:
yymm, where y represents years and m months. Instead of the yymm format
I just want to have it in months since otherwise I always have the jump
from 11 months (0011) to 1 year (0100).

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