Displaying 4 results from an estimated 4 matches for "lifereg".
2005 Feb 24
2
survreg with gamma distribution: re-post
...o the r-help mail
list. It hasn't generated any response, and I could really use some help
on this. Anyone able to help?
Thanks again,
Roger Dungan
>>
I am working on some survival analysis of some interval censored failure
time data in R. I have done similar analysis before using PROC LIFEREG
in SAS. In that instance, a gamma survival function was the optimum
parametric model for describing the survival and hazard functions. I
would like to be able to use a gamma function in R, but apparently the
survival package does not support this distribution. I have been
googling around for some h...
2005 Feb 01
0
Convergence problems with survreg()
...d be left blank, the maximisation barely
starts (2 iterations), and ends up yielding estimates close to 0 or +/-
infinity.
I guess the problem mainly lies in reasonably specifying starting values for
the optimisation embedded in survreg(). Even by inputing OLS estimates (the
default in the SAS lifereg method) ensuing inferences are remarkably
different, and with significantly lower log-likelihood, than the ones
returned by the SAS proc lifereg.
Has anybody encountered a similar problem? If so, any suggestion/advise would
be grately appreciated. Many thanks in advance, all best,
--
Dr. Stef...
2005 Jan 27
0
Survreg with gamma distribution
Dear r-help subscribers,
I am working on some survival analysis of some interval censored failure
time data in R. I have done similar analysis before using PROC LIFEREG
in SAS. In that instance, a gamma survival function was the optimum
parametric model for describing the survival and hazard functions. I
would like to be able to use a gamma function in R, but apparently the
survival package does not support this distribution. I have been
googling around for some h...
2012 Jul 06
4
differences between survival models between STATA and R
Dear Community,
I have been using two types of survival programs to analyse a data set.
The first one is an R function called aftreg. The second one an STATA
function called streg.
Both of them include the same analyisis with a weibull distribution. Yet,
results are very different.
Shouldn't the results be the same?
Kind regards,
J
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