[Date Prev][Date Next][Thread Prev][Thread Next][Date index][Thread index]

Re: st: RE: Comparison in survival analysis

From   "Frederick J. Boehmke" <[email protected]>
To   [email protected]
Subject   Re: st: RE: Comparison in survival analysis
Date   Sun, 16 Sep 2007 14:50:13 -0500 (CDT)

Have you looked into the -streg- option -ancillary()- ? This will allow you to specify covariates explaining the shape parameter in the Weibull.

On Sun, 26 Aug 2007, Aysegul Aydin wrote:

Date: Sun, 26 Aug 2007 10:58:42 -0600
From: Aysegul Aydin <[email protected]>
Reply-To: [email protected]
To: [email protected]
Subject: st: RE: Comparison in survival analysis


I was asking POLMETH a few weeks ago about a user-written or canned Stata
method to estimate generalized weibull though without much luck. Christopher
Zorn also adopted the same method in his 2000 Political Analysis article
"Modeling Duration Dependence". This is a method I believe that allows the
user to model the shape parameter with covariates. However, Zorn was using
LIMDEP, so I am not sure whether this is doable in Stata. But if any of our
colleagues have an idea about how to do this, I will also greatly appreciate
their feedback.

My best wishes,


-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of khan ali
Sent: Sunday, August 26, 2007 6:24 AM
To: [email protected]
Subject: st: Comparison in survival analysis

Dear members,
For the same data set,the estimated parameters(two
parametrs,alpha and beta(slope)) by weibull and
loglogistic models narrate a different story(having
different signs).How do the parameters of two
distribiutions can be compared?

The generalized weibull of Mudholkar,et al.(1996)
provides much greater flexibilty at the expense of an
additional shape parameter(having two shape parameters
and in total three parameters).How do we can estimate
this three parameter weibull distribution.

Thanks for comments and suggestions.

Be a better Heartthrob. Get better relationship answers from someone who
knows. Yahoo! Answers - Check it out.

*   For searches and help try:

*   For searches and help try:

                                                         - Fred

Note updated contact info (effective August 01, 2007):

 < ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 >  Frederick J. Boehmke
 <  Associate Professor of Political Science
 >  University of Iowa
 <  341 Schaeffer Hall
 >  Iowa City, IA 52242
 >  Office: 361 Schaeffer
 <  Phone:  319 335 2342
 >  Fax:    319 335 3400
 >  [email protected]
*   For searches and help try:

© Copyright 1996–2024 StataCorp LLC   |   Terms of use   |   Privacy   |   Contact us   |   What's new   |   Site index