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st: RE: update to -duncan- on SSC


From   "Reardon, Sean F." <[email protected]>
To   <[email protected]>
Subject   st: RE: update to -duncan- on SSC
Date   Thu, 16 Dec 2004 16:21:40 -0800

ben --

thanks for the -duncan- command.  for those interested, i compared it
with  -seg-, a command that i wrote to compute segregation indices
(-seg- is also available on SSC).  

-duncan- appears to allow weights, which -seg- does not (although counts
can be multiplied by frequency weights prior to running -seg- to achieve
the same effect i believe). 

-duncan- will also produce a matrix of dichotomous segregation indices
from a single command; -seg- would require a separate command for each
dichotomous index.

-seg- will compute a variety of segregation indices in addition to the
dissimilarity index (entropy index, gini index, exposure index, and
others); 

-seg- will compute multigroup versions of many of these indices as well
as the dichotomous versions.

-seg- will compute segregation indices from either grouped or individual
(with the 'unit()' option) data.

sean.

_____________________________
 
sean f. reardon
associate professor of education and (by courtesy) sociology
school of education
485 lasuen mall, #315
stanford university
stanford, ca 94305-3096
650.736.8517 (office phone)
650.725.7412 (office fax)
[email protected]
_____________________________
 

-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Jann, Ben
Sent: Thursday, December 16, 2004 6:40 AM
To: [email protected]
Subject: st: update to -duncan- on SSC

Thanks to Kit Baum, the -duncan- package has been 
updated on SSC.

-duncan- computes the Duncan and Duncan segregation 
statistic (dissimilarity index D) from individual 
level data.

The update incudes a new command called -duncan2- 
which also calculates D, however ...

  - ... can be applied to variables with a lot of 
    categories. The limits of -duncan- are 300 
    categories (Intercooled Stata) or 1200 categories 
    (Stata/SE).

  - ... displays all results in one table if used
    with the -by- prefix (e.g. -by country: ...-).

ben


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