rms (>= 4.1-3), lattice, latticeExtra, Formula, survival
rms (>= 4.3-1), lattice, latticeExtra, ggplot2, Formula,
survival
rms (>= 4.4-1), lattice, latticeExtra, ggplot2, Formula,
survival, methods
rms (>= 5.0-0), lattice, latticeExtra, ggplot2, Formula,
survival, methods, data.table