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12-02-2014 07:28 PM

I am looking to compare my output for a treatment effect in a regression model to an estimate of crude event rate obtained without using a regression model. The regression model is not causing any difficulties, but my other model is. I want to compute my total number of events and the follow-up time for each of my treatment groups so that I can provide a crude event rate for each of my treatment groups, but thus far I have not been able to achieve this. I assumed I could use a proc freq procedure:

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12-02-2014 07:44 PM

How would you calculate this by hand?

Its easiest if you post sample data (not necessarily actual data) with the desired output format/calculation.

For time based analysis I'm assuming you're using proc phreg? or proc lifereg?

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12-02-2014 08:18 PM

To calculate it by hand, I would only need a summary of the overall incidence between my treatment groups. Then I could provide a estimate of the crude event rate for each group. My data would look similar to this, except there will be many more observations:

Id trtgrp nevents followuptime

1 1 3 5

2 1 4 6

3 1 3 4

4 0 5 5

5 0 7 5

6 0 6 5

7 0 6 4

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12-02-2014 09:08 PM

What would the output be for this particular data example?

I'm just confused with an ID and the the nevents being 3, indicates multiple events per ID?