2011/7/21 Abdullah OUESLATI :
>
> [...]
> I do not understand why you expect to get comparable results with SAS
> "discrete" and coxph "exact". They are two different approaches to
> handling ties (as Terry explained; of course, some comparability
> should be expected in "normal" cases).
> [...]
>
[...]
I do not understand why you expect to get comparable results with SAS
"discrete" and coxph "exact". They are two different approaches to
handling ties (as Terry explained; of course, some comparability
should be expected in "normal" cases).
[...]
I didn't know precisely the specifities of
On Wed, Jul 20, 2011 at 12:02 PM, AO_Statistics wrote:
>
> Thomas Lumley-2 wrote:
>>
>> [...]
>>
>> The warning and error messages are correct here. Look at the point
>> estimate. It's a log hazard ratio of about 20 in one case and about
>> -20 in the other case. The true partial maximum likelih
Thomas Lumley-2 wrote:
>
> [...]
>
> The warning and error messages are correct here. Look at the point
> estimate. It's a log hazard ratio of about 20 in one case and about
> -20 in the other case. The true partial maximum likelihood estimator
> is infinite. The estimated standard errors are
Let me expand a bit on Thomas's answer.
Looking more closely at your data set you have the following:
death time group 0group 1
1.5 0/413/13
3 0/4 5/5
8 4/4 0
At time 1.5 group 1 had 13 deaths out of
On Wed, Jul 20, 2011 at 5:42 AM, AO_Statistics wrote:
>
> Terry Therneau-2 wrote:
>>
>> This query of "why do SAS and S give different answers for Cox models"
>> comes
>> up every so often. The two most common reasons are that
>> a. they are using different options for the ties
>> b.
Terry Therneau-2 wrote:
>
> This query of "why do SAS and S give different answers for Cox models"
> comes
> up every so often. The two most common reasons are that
> a. they are using different options for the ties
> b. the SAS and S data sets are slightly different.
> You have bot
Thank you so much, this was very helpful.
Svetlana
Terry Therneau wrote:
This query of "why do SAS and S give different answers for Cox models" comes
up every so often. The two most common reasons are that
a. they are using different options for the ties
b. the SAS and S da
This query of "why do SAS and S give different answers for Cox models" comes
up every so often. The two most common reasons are that
a. they are using different options for the ties
b. the SAS and S data sets are slightly different.
You have both errors.
First, make sure I have
Dear R-help,
I was comparing SAS (I do not know what version it is) and R (version
2.6.0 (2007-10-03) on Linux) survival analyses with time-dependent
covariates. The results differed significantly so I tried to understand
on a short example where I went wrong. The following example shows that
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