st: log rank test for paired data

[Susan Donath <susan.donath@mcri.edu.au>]

I have a small dataset (n=12 children) with time to event data for each eye 
(24 eyes). There are 2 subgroups (of the eyes), group 1 has less severe 
disease, group 2 has more severe disease. A child can have any combination 
of these (eg left eye more severe, right eye less severe, etc).
I can use  sts test to test for difference in time to event between the 2 
groups (using n=24 eyes) but this does not take into account the clustered 
nature of the data.
Is there any way I can do a log-rank test which takes into account the 
clustering?

Thanks


Susan Donath


Senior Research Fellow
Clinical Epidemiology and Biostatistics Unit
Murdoch Children's Research Institute & University of Melbourne Department 
of Paediatrics
Royal Children's Hospital
Parkville,  Vic. 3052.  AUSTRALIA

E-mail: susan.donath@mcri.edu.au
Tel. 9345 4742   Fax 9345 6000
All numbers area code 03 or international prefix +6

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