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st: defection rate and survival analysis

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Subject   st: defection rate and survival analysis
Date   Tue, 28 Apr 2009 13:19:31 +0200

I have a group of customers that received a offer at time t0 (start_date). The offer lasts for 6 months until t1 (end_date). I further have a variable that records the date (if) the customers defects (defection_date). I want to study whether the defection rate increases after the offer is not valid anymore. I also have a controlgroup that did not receive the offer, so I would like to compare the defection rate in the controlgroup against time between t0 and t1 and time > t1

Example of data,

id	start_date	end_date	defection_date controlgroup
1	1Jan2008	1July2008	.			1					
2	5Jan2008	5July2008	20feb2008		0
3	10Jan2008	10July2008	20July2008		0
4	15Jan2008	15July2008	.			0

At first I thought that I might compare mean defection rate when offer valid against when offer is not valid anymore. However, I have been browsing through some of the post done on survival curves/survival analysis. Now I am uncertain whether I should give that a try? Any comments is much appreciated.

Thanks for your consideration.

Also, I am using Stata 10.

Best wishes,
Alexander Severinsen

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