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Re: st: discrete hazard modells: irregular time intervals


From   Steve Samuels <sjsamuels@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: discrete hazard modells: irregular time intervals
Date   Thu, 27 May 2010 19:01:33 -0400

Oliver-

Welcome to Statalist! The -search- command is a very useful tool for
finding Stata resources.
"search interval censoring, all" turns up -intcens-. I also agree with
Robert about trying to simplify your data. If you can locate your
events to single years or even decades, then you could create grouped
follow-up intervals (they need not be of equal length) use the grouped
data methods of and use -pgmhaz8- and -hshaz-, programs contributed by
Stephen Jenkins, and downloadable with -ssc- .

I don't see that you can use methods for left-truncation, because you
lack the information on the start date for companies that were in
existence prior to 1900. At time "zero" your companies will be a
mixture of brand-new and established companies. I think this risks
serious bias. I strongly suggest that you analyze only companies whose
start dates you know.

As Robert said, disentangling age, period, and cohort effects can be
challenging. Take a look at the contributed -apc- command, also
available from -ssc-

-Steve

Steven J. Samuels
sjsamuels@gmail.com
18 Cantine's Island
Saugerties NY 12477
USA
Voice: 845-246-0774
Fax: 206-202-4783



>> ----- Original Message -----
>> From: Oliver Eger <oliver.eger@yahoo.de>
>> Date: Wednesday, May 26, 2010 8:14 am
>> Subject: st: discrete hazard modells: irregular time intervals
>> To: statalist@hsphsun2.harvard.edu
>>
>>
>> > Dear Stata users,
>> >
>> > I ‘am new to Stata and to the newsgroup. I would kindly ask for advice,
>> > concerning my work on survival analysis.
>> >
>> > I collected company data. My data are interval censored and interval
>> > truncated. The intervals are of irregular period in calendar time.
>> >
>> > Are there any methods to deal with this irregularities or at least to
>> > estimate their influence on my survival regressions?
>> >
>> > Best regards,
>> > Oliver
>> >

-- 
Steven Samuels
sjsamuels@gmail.com
18 Cantine's Island
Saugerties NY 12477
USA
Voice: 845-246-0774
Fax: 206-202-4783

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