Structural Equation Modeling. Mgmt 291 Lecture 8 – Model Diagnostics And Model Validation Nov. 16, 2009. Computing Problem 1: “Not positive definite”. determinant of the matrix =< 0 makes Log Σ and Log S undefined computing work can not move forward.
Lecture 8 – Model Diagnostics
And Model Validation
Nov. 16, 2009
Log|Σ(Θ)|+tr(S Σ-1(Θ)) – log|S| -(p+q)
TotalScore = (1)* Verbal
TotalScore = 1*Verbal
a constant times the diagonal of S is added to S
repeat 10 times until the matrix becomes positive-definite
Correlation matrix and set error var as 0
Solves the problem.
Step by step
Save Sigma from ex9b.spl