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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   Thu, 21 Mar 2013 12:40:07 +0100

Dear Gwinyai,
the complexity of your seemingly simple model rests on the fact that one predictor is not enough to explain differences in delivery mode.
I can bet that no researcher of no reserch field hopes to be successful in publishing a one-predictor logistic regression model.
In case  you did not perform it yet, I would suggest to take a look (via PubMed or Medline) at what others have published on this topic in the past and the methods they follow.
For instance, the following key-word: determinants AND caesarean AND delivery in PubMed give me back 90 results (and part of them can be downloaded in extenso free of charge from journals website): some articles can be of interest for your research purposes.
Best regards,
Carlo 
-----Messaggio originale-----
Da: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] Per conto di Gwinyai Masukume
Inviato: giovedì 21 marzo 2013 12:18
A: statalist@hsphsun2.harvard.edu
Oggetto: Re: st: Interpretation of Two-sample t test with equal variances?

Carlo. Thanks once again. Well, an apparently simple mode of delivery which has 2 possible outcomes is turning out to be far more complex than I anticipated.
With gratitude,
Gwinyai

On 3/21/13, Carlo Lazzaro <carlo.lazzaro@tiscalinet.it> wrote:
> Dear Gwinyai,
> if you prefer to avoid a discussion about the indications for 
> C/section, you can consider some hospital features as predictors 
> instead (e.g.: public or private; teaching hospital or else; number of 
> beds of the obstetrics unit grouped in different categories (0-10; 
> .....); number of births per year grouped in different categories; 
> ...).
> Kind regards,
> Carlo
> -----Messaggio originale-----
> Da: owner-statalist@hsphsun2.harvard.edu
> [mailto:owner-statalist@hsphsun2.harvard.edu] Per conto di Gwinyai 
> Masukume
> Inviato: mercoledě 20 marzo 2013 22:07
> A: statalist@hsphsun2.harvard.edu
> Oggetto: Re: st: Interpretation of Two-sample t test with equal variances?
>
> Carlo - thanks, i was skeptical about going into a discussion about 
> the indications for C/section which can be relative or absolute; 
> maternal, fetal or materno-fetal.
>
> Austin - thanks for the link and pointing out that a pseudo R2 should 
> not be a worry. by increasing the sample size a thousand fold i guess 
> what that which is being detected is so small that in the end it's not 
> worth it (detecting something so small)?
>
> Thanks all round. Appreciated.
>
> G
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