Back-transform rotated mmes random effects
rotate_back_mmes.RdBack-transforms the selected relationship random effect from the solver eigenbasis to the original relationship-level basis.
Details
If \(Gu=U\Lambda U'\) and \(a\) denotes the solver-basis effect, the
reported effect is \(g=Ua\). Fitted mmes objects already expose this
original-basis effect in uList; this function provides the explicit
transformation from the retained engine output.