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R: st: Interpretation of Two-sample t test with equal variances?


From   "Carlo Lazzaro" <carlo.lazzaro@tiscalinet.it>
To   <statalist@hsphsun2.harvard.edu>
Subject   R: st: Interpretation of Two-sample t test with equal variances?
Date   Wed, 20 Mar 2013 18:11:25 +0100

Dave is right. 
Actually I have read Gwinyai's post too fast and suggested something wrong.
I am currently engaged in a project concerning pre-term delivery as
dependent variable, that I have mistaken as Gwinyai's y, too.
Anyway, provided that this is not a homework or an exercise on logistic
regression, I confirm my concerns about the limited number of predictors in
Gwinyai's model.
For instance, are all the women included in the model at their first
delivery?
Best regards,
Carlo

-----Messaggio originale-----
Da: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] Per conto di David Hoaglin
Inviato: mercoledì 20 marzo 2013 17:33
A: statalist@hsphsun2.harvard.edu
Oggetto: Re: st: Interpretation of Two-sample t test with equal variances?

Carlo,

What meaning do you assign to an interaction between mode_delivery (the
outcome variable) and age (the predictor)?

David Hoaglin

On Wed, Mar 20, 2013 at 10:48 AM, Carlo Lazzaro
<carlo.lazzaro@tiscalinet.it> wrote:
> Gwinyai,
> your Pseudo R2       =     0.0015 seems very low.
> Are you sure that all the relevant independent variables have been 
> included in your model?
>
> You may also consider searching for interactions between mode_delivery 
> & age.
>
> Best regards,
> Carlo
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