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st: segregation measures at the census tract level

From   "Joseph Sudano" <>
To   <>
Subject   st: segregation measures at the census tract level
Date   Mon, 24 Feb 2003 16:03:44 -0500

OK...we are familiar with the aggregate measures of segregation at the city/MSA level.  What if one wants to characterize the racial/ethnic population of a census tract relative to the city/MSA in which it is embedded?  A simple minority percentage or proportion in a tract wont capture the dispersion of a group across's just a compositional measure.  We are thinking of using the following (and are eliciting feedback):  
(Tdiff) - (mean of Tdiff)/ (S.E of Tdiff), 
where Tdiff= proportion of minority group X in the tract minus the proportion of X in the city/MSA; mean of Tdiff= city/SMA specific mean of Tdiffs; and S.E. of Tdiff=city/MSA specific S.E. of Tdiffs.  We have also toyed around (cognitively) with using the S.E. of all Tdiffs across the US in the denominator....very confused.  Any help/comments appreciated.

I'll take personalized responses if folks would rather not muddy up the list with such a specific issue and if you have any questions about why we want to have a measure of segregation at the tract level,  but hey, you decide.  

Joseph J. Sudano, Jr., Ph.D.
Senior Instructor of Medicine
Center for Health Care Research and Policy
Case Western Reserve University at The MetroHealth System
Rammelkamp 236A
2500 MetroHealth Drive
Cleveland, OH 44109
Office: 216.778.1399
Fax:    216.778.3945 

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