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Hi Mike and colleagues,
I am trying to estimate a TSSEM model and then test the moderating effect. I am following the wonderful resources provided by you and your team. However, when I compare the constrained and unconstrained models, the difference in degrees of freedom is higher than expected.
In my analysis (model figure and R code attached), I am constraining the A matrix to be equal i.e., I am placing equality constraints on my regression coefficients. My S matrix has 5 parameters - these parameters are not constrained across two models. So, shouldn't my delta df should be 5? However, I get a delta df of 9.
In a subsequent moderator analysis, I am constraining a single regression coefficient to be equal across the two groups. However, my delta df turns out to be 2. I am not sure where I am going wrong. Your help will be appreciated.
Thanks in advance for your help.
Regards,
Srikanth Parameswaran