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Topic: offset adjustment in Cox proportional hazard?
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Ralph Wasson

Posts: 108
Registered: 12/6/04
offset adjustment in Cox proportional hazard?
Posted: Jan 16, 2014 10:15 PM
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In the logistic regression, if I select all the events and a percentage
of non-events, I need to either assign weights or apply offset
adjustment so that my predicted values would reflect the ratio of bads
to goods in the original data set. How about in Cox proportional hazard
model with panel data?
Then, here is a sampling methodology and I think is reasonable but would
like your opinions.
Suppose I have a large panel data set and the status (event or non-
event) is recorded at the last observation of each individual. First, I
create a data set containing only the last observation of each
individual. Second, I select 10% (say) of the events and 10% (say) of
the non-events. Third, I merge the stratified sample with the original
panel data to form a panel sample.
Do you think this sampling methodology is reasonable?
Thank you much for your help.

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