I'm working on a model similar to Marsh and O'Mara (2008) including single indicators (grades). These authors "...constrained the standardized uniqueness for each of these measures to be .10 (reflecting a conservative estimate of reliability of .90)" (p. 547).
I'd like to add such a constraint to my model, too, but I'm only aware of the possibility to constrain unstandardized coefficients which, i guess, would be
I found that constraining standardized coefficients might be available using the MODEL CONSTRAINT option but I have no idea how to tell Mplus that it is the standardized coefficient, I'd like to constrain using this option. Maybe somebody has a solution or at least a good point to start...
Thanks in advance!
Marsh, H. W., & O'Mara, A. (2008). Reciprocal effects between academic self-concept, self-esteem, achievement, and attainment over seven adolescent years: Unidimensional and multidimensional perspectives of self-concept. Personality and Social Psychology Bulletin, 34, 542-552.