The new projpred versions (`>= 2.0.0`

) have gained argument `search_terms`

in `cv_varsel()`

and `varsel()`

. My question concerns the terms which are not included in `search_terms`

: Are they always included? For example, consider the reference model formula `y ~ (1 | subject) + x1 + x2 + x3`

. If I then specify `search_terms = c("x2", "x3")`

, does that mean that `y ~ (1 | subject) + x1`

is taken as the “baseline” model whose terms are always included during the search process? Or is that “baseline” model given by `y ~ 1`

, meaning that the terms `(1 | subject)`

and `x1`

are excluded?

Perhaps @AlejandroCatalina can help with this?