I was hoping Lavaan would provide brief MSEM validation for a model I've been working on (attached). While not new to R-lmer, I am new to Lavaan. Efforts to replicate the model have seen me produce two scripts, though both appear to generate the same error messages (attached). I guess I would like to know which script is the better approach and what I am doing wrong? The ERROR model syntax defines multiple groups, data suggest a single group has me really perplexed, since "stn_id" has been the shared level focus in all of my R analyses to date. Hope you can help.
My thanks and best wishes,