Published on *OpenMx* (http://openmx.psyc.virginia.edu)

By *IanCero*

Created *02/14/2012 - 22:10*

Tue, 02/14/2012 - 22:10 — IanCero [1]

Hello all,

I'm trying to estimate the reliability of a sub-scale using a procedure outlined in Raykov (2004), which is attached. If I understand it correctly, I need to constrain the path from each error term to its respective indicator to be equal to the sum of factor loadings. That is, the path from E1 to Y1 must equal L1+L2+...+Lk .

Further, I need to specify dummy latent variables with variances that are equal to my constrained residual variances.

I have tried to set up part of the model (syntax attached), but I can't even get the model to accept the first dummy variance (error thrown: "Error in A_free[to, from] <- nextfree : subscript out of bounds").

The last page of the Raykov (2004) article has LISREL syntax for the same project. Am I on the right track? Does anyone know how to set up a model like this in OpenMx?

Attachment | Size |
---|---|

Raykov 2004 - Reliability with Linear Constraints.pdf [2] | 114.1 KB |

Raykov Syntax.txt [3] | 1.02 KB |

**Links:**

[1] http://openmx.psyc.virginia.edu/users/iancero

[2] http://openmx.psyc.virginia.edu/sites/default/files/Raykov 2004 - Reliability with Linear Constraints.pdf

[3] http://openmx.psyc.virginia.edu/sites/default/files/Raykov Syntax.txt

[4] http://openmx.psyc.virginia.edu/thread/1291

[5] http://openmx.psyc.virginia.edu/thread/1250

[6] http://openmx.psyc.virginia.edu/forums/opensem-forums/confirmatory-factor-analysis-and-measurement-models