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Sociological Methods & Research
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Simulation Studies of the Reliability of Computer-Aided Model Specification Using the TETRAD II, EQS, and LISREL Programs

PETER SPIRTES

Carnegie-Mellon University

RICHARD SCHEINES

Carnegie-Mellon University

CLARK GLYMOUR

Carnegie-Mellon University

TETRAD II, a fully automated successor to the TETRAD program, is intended to aid in the respecification of underspecified linear causal models, or structural equation models. The performance of TETRAD II is compared with the automatic respecification procedures in the EQS and LISREL VI programs using 360 simulated data sets from nine different linear models containing "latent" or unmeasured variables. LISREL VI and EQS each output a single suggested model; TETRAD II outputs a small list of such models. For these cases, we find that the TETRAD II program, which uses graph algorithms and heuristic search techniques, is more reliable (although less precise) than either EQS or LISREL VI, which use numerical algorithms and beam search techniques. A detailed analysis of the reasons for these differences is offered. Contrary to those who dismiss automated search techniques as unreliable "ransacking" or "data mining," TETRAD II provides correct information about the true model for 95% of the large sample data sets. The need for further simulation tests and the prospects for the development of automated techniques to aid in the initial specification of causal models for nonexperimental data are discussed.

Sociological Methods & Research, Vol. 19, No. 1, 3-66 (1990)
DOI: 10.1177/0049124190019001001
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