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Re: st: declaring a person period dataset and fitting discrete-time survival models with st and MI


From   Steve Samuels <sjsamuels@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: declaring a person period dataset and fitting discrete-time survival models with st and MI
Date   Thu, 5 Aug 2010 12:46:27 -0400

Indeed -cloglog-- can be used with -mi estimate-
(http://www.stata.com/help.cgi?whatsnew10to11)

Steve


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


On Thu, Aug 5, 2010 at 11:55 AM, Steve Samuels <sjsamuels@gmail.com> wrote:
>  -cloglog- is an official Stata command, so perhaps it will work with
> MI.   With data in the person-period format, --cloglog- does not take
> a "time" variable. See "lesson 8" referenced below
>
>  The _d1 _d2 dummies are used as covariates so that you can get a
> separate estimate of the probability in each period.
>
>
> See Chapter 9, especially Section 9.3, of Stephen Jenkins's wonderful
> book "Survival Analysis" at
> http://www.iser.essex.ac.uk/files/teaching/stephenj/ec968/pdfs/ec968lnotesv6.pdf
>
> and his lesson 8 on setting up the analysis with Stata at
> http://www.iser.essex.ac.uk/survival-analysis
>
> all at:
> http://www.iser.essex.ac.uk/study/resources/module-ec968
>
> Steve
>
> --
> Steven Samuels
> sjsamuels@gmail.com
> 18 Cantine's Island
> Saugerties NY 12477
> USA
> Voice: 845-246-0774
> Fax:    206-202-4783
>
>
> On Thu, Aug 5, 2010 at 9:08 AM, Clara Barata
> <maria_barata@mail.harvard.edu> wrote:
>> Hi!
>> I am trying to fit some survival analysis models to a person period
>> dataset using stata/mp 11. My ultimate goal is to be able to use MI
>> for data imputation, then analyze the data using mi estimate: together
>> with a survival analysis command. My two questions are the following:
>>
>> 1)  How do i declare the data to be person-period with multiple
>> dummies for time? stset seems to require the specification of just one
>> time variable. Should I just use _period?
>> 2) Is there a discrete-time survival model option within the st
>> commands? I was using the command "dthaz" for discrete time models,
>> but that does not seem compatible with "mi estimate".
>>
>> Thanks, Clara
>>
>> Here's my syntax and output for creating the person period dataset:
>>
>> * I used the command prsnperd to create the person-period dataset as follows
>>
>> . list newid time evercc censor if newid==1002 | newid==1007 |
>> newid==1086 , noobs
>>
>>  +--------------------------------+
>>  | newid   time   evercc   censor |
>>  |--------------------------------|
>>  |  1002      5        0        1 |
>>  |  1007      4        1        0 |
>>  |  1086      1        1        0 |
>>
>>
>> prsnperd newid time censor
>>
>> list newid _period _Y _d1 _d2 _d3 _d4 _d5 _d6 if newid==1002 |
>> newid==1007 | newid==1086 , noobs
>>
>> +----------------------------------------------------------+
>> newid   _period   _Y   _d1   _d2   _d3   _d4   _d5   _d6
>> ----------------------------------------------------------
>> 1002         1    0     1     0     0     0     0     0
>> 1002         2    0     0     1     0     0     0     0
>> 1002         3    0     0     0     1     0     0     0
>> 1002         4    0     0     0     0     1     0     0
>> 1002         5    0     0     0     0     0     1     0
>> ----------------------------------------------------------
>> 1007         1    0     1     0     0     0     0     0
>> 1007         2    0     0     1     0     0     0     0
>> 1007         3    0     0     0     1     0     0     0
>> 1007         4    1     0     0     0     1     0     0
>> 1086         1    1     1     0     0     0     0     0
>> +----------------------------------------------------------+
>> *
>> *   For searches and help try:
>> *   http://www.stata.com/help.cgi?search
>> *   http://www.stata.com/support/statalist/faq
>> *   http://www.ats.ucla.edu/stat/stata/
>>
>

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