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Mplus Users Guide v6.. - Muthén & Muthén

Mplus Users Guide v6.. - Muthén & Muthén

Mplus Users Guide v6.. - Muthén & Muthén

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CHAPTER 17right-hand side of one or more parameter constraint statements.Following is an example of how to define an explicit constraint:MODEL:[y1-y3] (p1-p3);MODEL CONSTRAINT:p1 = p2**2 + p3**2;where the parameter p1 is constrained to be equal to the sum of thesquares of the p2 and p3 parameters.Following is an example of how to define an implicit constraint where afunction of parameters is constrained to be zero:MODEL:[y1-y5] (m1-m5);MODEL CONSTRAINT:0 = - m4 + m1*m3 - m2;0 = exp(m3) - 1 - m2;0 = m4 - m5;Following is an example of how to define an implicit constraint where aparameter appears in a set of parameter constraints:MODEL:[y1-y4] (p1-p4);MODEL CONSTRAINT:p1 = p2**2 + p3**2;p2 = p4;THE MODEL TEST COMMANDThe MODEL TEST command is used to test linear restrictions on theparameters in the MODEL and MODEL CONSTRAINT commandsusing the Wald chi-square test. These restrictions are defined usinglabels from the MODEL command and labels from the NEW option ofthe MODEL CONSTRAINT command. Variables listed on the618

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