Generalization of the Tetrad Representation Theorem
Authors: Glenn Shafer, Alexander Kogan, and Peter Spirtes
ABSTRACT
The tetrad representation theorem, due to Spirtes, Glymour, and
Scheines (1993), gives a graphical condition necessary and sufficient
for the vanishing of tetrad differences in a linear correlation structure.
This note simplifies their proof and generalizes the theorem. This
generalization can strengthen procedures used to search for structural
equation models for large data sets.
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