stats, grid, graphics, methods, nlme, rpart, numDeriv, ucminf,
zoo, sandwich, strucchange
stats, grid, graphics, methods, nlme (>= 3.1-123), rpart,
numDeriv, ucminf, zoo, sandwich, strucchange
stats, grid, graphics, methods, nlme (>= 3.1-123), rpart,
formula.tools, numDeriv, ucminf, zoo, sandwich, strucchange