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st: RE: segregation measures at the census tract level

From   "Sayer, Bryan" <>
To   "''" <>
Subject   st: RE: segregation measures at the census tract level
Date   Tue, 25 Feb 2003 09:52:44 -0500

If nothing else, you have the problem of comparing a portion to a whole,
which is not independent.  That is, the metro area contains the tract and
thus any standard error term needs to contain the covariance.

Bryan Sayer
Statistician, SSS Inc.

-----Original Message-----
From: Joseph Sudano []
Sent: Monday, February 24, 2003 4:04 PM
Subject: st: segregation measures at the census tract level

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
(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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