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Re: st: No observations in stcox models
From
Nicole Boyle <[email protected]>
To
[email protected]
Subject
Re: st: No observations in stcox models
Date
Fri, 8 Nov 2013 14:00:33 -0800
Hi Barth,
What does your -stset- code and output look like? I'm wondering if the
enter and/or exit times you've specified have denied all of your
failure events from being observed.
Nicole
On Fri, Nov 8, 2013 at 9:47 AM, Barth Riley <[email protected]> wrote:
> Dear list
>
> I am running a series of Cox regression models using stcox in Stat 11. I am
> obtaining the error message "No observations," despite the fact that the
> effective sample size (excluding missing values on all predictors and the
> failure variable) is between 150 and 550. There is also variability on all
> model variables. I should note that some of the predictors are
> categorical/ordinal and thus separate dummy variables for each category are
> being included in the model via the xi command. Could missing categories
> cause this error? Are there other factors to consider in determining the
> effective sample size for a Cox model?
>
> Thanks in advance
>
> Barth
>
>
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