BUGS/ISSUES:
calling profile, etc. on mle objects
created inside a function doesn't work
should print warning immediately if convergence fails
TO DO:
more documentation -- especially S4 methods!
catch/interpret more error messages?
(try to filter last.warning?)
WISHLIST:
analytic derivatives
relist
subset
predict (feasible for formula arguments
if we know the MEAN of the relevant distribution?)
document argument handling:
start must be a named vector or a named list
[OR?? inherit from parnames(minuslogl)?]
if start is not a list (i.e. a numeric vector)
set vecpar TRUE
convert start to a list
if missing and default.start is TRUE use formals(minuslogl)