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Just finished reading “Transportability across studies: A formal Approach” by Judea Pearl and Elias Bareinboim, March 2012, UCLA, Technical Report R-372.

Tuesday, April 9th, 2013

Another gem by Professor Pearl and Elias Bareinboim.  It identifies the external validity practice of making threats versus license.  The causal mechanisms in an experimental group and the observational group influence license for external validity.   There is even help  for moving from an observational situation to another observational population.   This is a must reading for any serious statistician or practitioner that creates statistical models and then applies them.

Just finished reading “Commentator: A Front-End User-Interface Module for Graphical and Structural Equation Modeling” by Trent Mamoru Kyono, May 2010, UCLA, Technical Report R-364.

Monday, April 8th, 2013

Requires the compilation of the included C code for the module using Microsoft Visual Studio 2008.  Uses the Structural Equation Modeling software EQS software version 6.1 2006.  A first step in implementing Pearl’s causality interpretation of SEM (Structural Equation Models) using graphical diagrams to encode the causality and provides a means to determine structural causality zeros and constraints.  I have the trial version of the EQS software and plan on compiling the code to replicate some of the examples int he paper.