Bookmark and Share

Notice: On April 23, 2014, Statalist moved from an email list to a forum, based at statalist.org.


[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: st: How to handle large (or small) odds ratios


From   David Hoaglin <dchoaglin@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: How to handle large (or small) odds ratios
Date   Fri, 18 May 2012 08:16:38 -0400

Hi, Tim.

Thanks for the update.

When a category contains a small number of observations, it is often
necessary to combine it with other categories.

Regards,

David

On Fri, May 18, 2012 at 7:53 AM, Tim Evans <Tim.Evans@wmciu.nhs.uk> wrote:
> Hi David,
>
> Thanks for your response - my table formatting was not quite like that when it was sent!
>
> Having reviewed the data behind the analysis, Ive decided the prudent approach is to remove the staging analysis for those particular adjusted O/Rs as they were based on small numbers. I've also had a look at:
>
> 'How should one interpret 1.00E+00 as the LCI and UCI for Complex mixed
> and stromal?  Is the standard error of that OR so small that the LCI
> and UCI both round to 1.00?  Many other CIs are fairly wide.'
>
> Again, having looked at the number of cases, they are based upon either a single case, or a very small fraction of the total and appear to be behaving in the exact manner as the reference group. Given the apparent lack of robustness here, I've removed these also.
>
> Thanks for helping me to see the obvious. The results I have now are much more sensible.
>
> Best wishes
>
> Tim

*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/


© Copyright 1996–2018 StataCorp LLC   |   Terms of use   |   Privacy   |   Contact us   |   Site index