always ignored. The arguments \code{k} and \code{rate} are ignored.}
\item{A character:}{these are the same short-cuts than in the function
- \link{\code{ace}}: \code{"ER"} is an equal-rates model, \code{"ARD"}
+ \code{\link{ace}}: \code{"ER"} is an equal-rates model, \code{"ARD"}
is an all-rates-different model, and \code{"SYM"} is a symmetrical
model. Note that the argument \code{rate} must be of the appropriate
length, i.e., 1, \eqn{k(k - 1)}, or \eqn{k(k - 1)/2} for the three models,