Specifying manifest items in formula of glca
function.
item(..., starts.with = NULL, ends.with = NULL)
vectors of manifest items. These can be given as named arguments which is colnames of data.frame
.
a string for prefix of variable names to be selected.
a string for suffix of variable names to be selected.
a matrix
of specified variables, which contains names and levels of manifest items.
## For examples see example(glca)