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st: Simplification of formula in logistic regression


From   Mikkel Brabrand <mikkel@brabrand.net>
To   statalist@hsphsun2.harvard.edu
Subject   st: Simplification of formula in logistic regression
Date   Sun, 15 May 2011 16:43:19 +0200

All,

I have performed a logistic regression analysis including five variables and one outcome. However, I would like to simplify the formula significantly for clinical use. So, instead of the formula been something like -12.22+2.33*systolic blood pressure-1.21*temperature etc., I would like to make a scoring system where the score is calculated on basis of the measured values of the vital signs. 

An example could be something like this

.................2 points..1 point...0 points...1 point.....2 points

Pulse	...........-30........31-50....51-100....101-200..201-

Sys. BP.........-60........61-100..101-200...201- 

However, I have no idea how to find the optimal cut-off points. Do any of you have a suggestion how to do this statistically correct?



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