Bookmark and Share

Notice: On March 31, it was announced that Statalist is moving from an email list to a forum. The old list will shut down on April 23, and its replacement, is already up and running.

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

Re: st: Recovering cell values from odds ratios

From   Maarten Buis <>
Subject   Re: st: Recovering cell values from odds ratios
Date   Tue, 31 May 2011 14:26:05 +0200

On Tue, May 31, 2011 at 2:06 PM, King, Carina wrote:
> Thanks for replying, but I think I'm a bit confused, I've attached the example I'm using:
> Cases: 218
> Controls: 14748
> Total: 14966
> Risk factor:      OR:    p:       case exposed(a): control exposed (b): case unexposed(c): control unexposed(d):
> Unconsciousness   3.54   0.77973   48              3248                 170                       11500
> Age >65 years     1.69   0.62825   81              5483                 137                       9265
> Female gender     1.66 0.62406 82                 5544                 136                       9204
> With the method you describe, the p for each comes out as shown above and consequently the numbers in each group. BUT when I then checked by recalculating the odds ratio from the numbers given, they all equal 1. What am I missing?  Thank you!

I don't understand what you did your example. What is p and where did
it come from? Which part of those numbers did you compute and which
were given. How did you do the computations?  Where is the baseline

Generally, I think your example contains too many variables. The best
strategy for problems like these is to start with an easy example,
i.e. one variable, work till you understand that and than complicate
matters till you get what you want.

-- Maarten

Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen

*   For searches and help try:

© Copyright 1996–2016 StataCorp LP   |   Terms of use   |   Privacy   |   Contact us   |   Site index