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


From   Clara Barata <maria_barata@mail.harvard.edu>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: declaring a person period dataset and fitting discrete-time survival models with st and MI
Date   Tue, 10 Aug 2010 11:49:05 -0400

Thanks Steve!
Clara

On Mon, Aug 9, 2010 at 1:08 PM, Steve Samuels <sjsamuels@gmail.com> wrote:
>
> Discrete analysis is covered  in Lesson 6, not Lesson 8, at:
> http://www.iser.essex.ac.uk/study/resources/module-ec968.  The link to
> Lesson 6 is: http://www.iser.essex.ac.uk/files/teaching/stephenj/ec968/pdfs/ec968st6.pdf
>
> My apologies for the incorrect reference.
>
> Steve
>
> 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/
> >>
> >
>
>
>
> --
> Steven Samuels
> sjsamuels@gmail.com
> 18 Cantine's Island
> Saugerties NY 12477
> USA
> Voice: 845-246-0774
> Fax:    206-202-4783
>
> *
> *   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/



--
M. Clara Barata, Ed.M
Doctoral student, Human Development and Education
Harvard Graduate School of Education
Larsen 705, 14 Appian Way
Cambridge, MA 02138

Lab phone: 617-496-0535
Fax: 617-495-3626
Cell: 857-253-1138

*
*   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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