dot-detect_L2_only: Detect whether the predictors are L2-only
In LMMELSM: Fit Latent Multivariate Mixed Effects Location Scale Models

.detect_L2_only

R Documentation

Detect whether the predictors are L2-only

Description

Detects whether the predictors are level-2 only. E.g., whether location and scale are covariates are the same across all n_k observations of each K. This is important for efficiency reasons. If the covariates are invariant across repeated observations of the given group k, for all K, then we can compute predicted values once, and broadcast the prediction, rather than compute the prediction for every single row. Specifically, it detects if all x == x[1], where x is a group's data, for each column in mf.