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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