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I am confused what you mean by this.

"Well don't put them into the model as dummies - put them in as a categorical so you have control. " What is the difference between a dummy variable and a categorical variable?
Dear Lazar

I hope you are well, I am trying to do Multi group comparisons using Lisrel but I keep receiving the following error, Can you kindly assist.

W_A_R_N_I_N_G: Matrix to be analyzed is not positive definite,
ridge option taken with ridge constant = 10.000