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Re: st: Logistic regression interpretation
From
"Dr. Bill Westman" <[email protected]>
To
[email protected]
Subject
Re: st: Logistic regression interpretation
Date
Tue, 21 Sep 2010 15:11:39 -0700
I apologize for the math error (7 times higher - not 6.) - Also - Is
the command
listcoef, help percent
logistic (N=308): Percentage Change in Odds
Odds of: no vs yes
----------------------------------------------------------------------
abuse | b z P>|z| % %StdX SDofX
-------------+--------------------------------------------------------
Risk | 1.56659 2.898 0.004 379.0 49.8 0.2580
group | 0.74725 1.732 0.083 111.1 44.8 0.4952
----------------------------------------------------------------------
indicating that the odds of survival are 111% higher for Treatment
group? and if so - is that 111% at both High/Low risk Levels?
On Tue, Sep 21, 2010 at 2:36 PM, Dr. Bill Westman <[email protected]> wrote:
> Dear Listers: I have more of a stats question than a stata question,
> but here goes:
>
> A simple logistic regression was run - outcome - Survived/Non Survived
> (1/0), with Group(Treatmeant/Control -- 1/0) & Risk(High/Low -- 1/0)
>
> The results
> ------------------------------------------------------------------------------
> Survived | Odds Ratio Std. Err. z P>|z| [95%
> Conf. Interval]
> -------------+----------------------------------------------------------------
> Risk | 4.790295 2.589136 2.90 0.004 1.660699 13.81763
> group | 2.111181 .9107981 1.73 0.083 .9063649 4.917538
> ------------------------------------------------------------------------------
>
> Assuming the .10 level of significance was acceptable (for discussion purposes)
>
> Can I assume that odds of treatment survival were 2.1 times higher in
> the treatment Group for LOW risk patients?
> And for High Risk patients in the treatment group is the adds 4. 8 +
> 2.1 (or 7 times higher)?
>
> Other than test for interactions, can I run a graphs of these two groups?
>
> Can I estimate the "average" effect of Treatment across both high and
> low risk patients? If so, how?
>
> What other tests might I wish to do in Stata?
>
> Thanks
>
> Bill
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