st: update propcnsreg available from SSC

[Maarten buis <maartenbuis@yahoo.co.uk>]

Thanks to Kit Baum an update of the -propcnsreg- package is 
now available from SSC. To update this package either type 
-ssc install propcnsreg, replace- or -adoupdate-. 

propcnsreg combines information from several observed variables
into a single latent variable and estimates the effect of this
latent variable on the depedent variable. These observed
variables are so-called causal indicators (Bollen 1984, Bollen 
and Lennox 1991), that is, the observed indicators influence 
the latent variable. It forms an alternative to models like 
factor analysis, which assume that the latent variable 
influences the observed indicators.

An alternative interpretation of this model is that it fits a 
regression with a proportionality constraint, hence the name
of the -propcnsreg- package. 

This update consists of a new option (-logit-) that extends
this model for binary dependent variables, by estimating 
this model within a logitstic regression.

-- Maarten


References:

Bollen, Kenneth A. 1984. "Multiple Indicators: Internal 
Consistency or No Necessary Relationship" Quality and
Quantity 18(4): 377-385.

Bollen, Kenneth A. and Richard Lennox. 1991. "Conventional 
Wisdom on Measurement: A Structural Equation Perspective" 
Psychological Bulletin 110(2): 305-314.


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

http://www.maartenbuis.nl
--------------------------


      

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