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st: Survival Data - Compare hazards by matching on age
From
asb stata <[email protected]>
To
[email protected]
Subject
st: Survival Data - Compare hazards by matching on age
Date
Tue, 9 Mar 2010 02:02:19 -0500
There are two groups of subjects in my data. In the first group, all
subjects are at risk of dying since age 1. In the second group, each subject
becomes at risk of dying from a subject-specific age different from 1. I
want to stset the data properly and graph Kaplan-Meier survival curves for
the two groups. A sample of data is presented below. id is unique subject
id. group is 1 if subjects do not become at risk of dying until flag=1.
Subject 1 becomes at risk of dying only at age 2 or after unlike subjects 3
and 4 which become at risk of dying at age 1. died indicates the actual
failure event. The data is set as multiple-record-per-subject. I do not want
to compare the hazard of exit of the two groups without taking into account
the fact that the members of the first group do not become at risk until a
certain (variable) age. I want to compare the hazard of exit for the two
groups by comparing subjects of the same age across groups. How do I do it
in stata? How to match subjects by age and compare hazard of exit? Is there
another way besides matching on age?
id group flag age died
1 1 0 1 0
1 1 1 2 0
1 1 1 3 0
1 1 1 4 1
2 1 0 1 0
2 1 0 2 0
2 1 0 3 0
2 1 0 4 0
2 1 1 5 0
2 1 1 6 1
3 2 1 1 0
3 2 1 2 0
3 2 1 3 1
4 2 1 1 0
4 2 1 2 0
4 2 1 3 0
4 2 1 4 0
4 2 1 5 1
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