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st: RE: Criteria for stratification??

From   "Nick Cox" <>
To   <>
Subject   st: RE: Criteria for stratification??
Date   Wed, 16 Jun 2004 16:12:56 +0100

This kind of question is very difficult to answer
in a useful and responsible way, possibly even if (unlike 
me) you have experience with assessing "health 
status" data. The question in effect presupposes
that there are good technical answers independent 
on what the data are like and what the precise 
research problem is. 

My awkward question in return is based on the fact that's 
it's discrete already. Why do you want to lump 
categories further, thus producing a loss of 


> I have a discrete variable (health status)  which takes value 
> from -1.6 
> to 1. The data consists of pre and post values of the 
> variable. I want 
> to categorize the variable in  3-7 categories in order to study the 
> movement between categories . How can I do this? What 
> Criteria should I 
> use to determine the best categorization, in terms of 1. number of 
> categories and, 2. cutoffs. Please respond.

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