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st: update sheafcoef available from SSC

From   Maarten buis <[email protected]>
To   stata list <[email protected]>
Subject   st: update sheafcoef available from SSC
Date   Fri, 22 Jan 2010 16:41:47 +0000 (GMT)

Thanks to Kit Baum an update of the -sheafcoef- package is now 
available from SSC. The -sheafcoef- package computes so-called 
sheaf coefficients (Heise 1972), which is a special case of a 
model for causal indicators. If we measure the same concept 
multiple times, than we have more information about that 
variable, but we need a model that can use this additional 
information. There are two types: models for effect indicators, 
like factor analysis, which assume that the underlying latent 
variable influences the observed indicators, and models for 
causal indicators, which assume that the observed indicators 
influence the latent variable. 

Sheaf coeficients are the simplest variant in this family of 
models, and it does not imply a testable constraint. It is 
mainly useful for comparing the effects of blocks of variables. 
For example, we may have a block of variables describing the 
home situation and another block of variables that represent 
the work situation and we ask ourselves whehter the home 
situation or the worksituation is more important for the 
dependent variable. A more complete discussion of this package 
can be found here: <>.

This update improved the display of the results and is quicker. 
To instal typ in Stata -ssc instal, replace-.

-- Maarten

Heise, David R. (1972). Employing nominal variables, induced variables, and block variables in path analysis.  Sociological Methods & Research, 1(2): 147--173.

Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen


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