R(>= 2.5.0), MASS, nlme, splines, survival
R (>= 2.5.0), MASS, nlme, splines, survival
R (>= 2.7.0), MASS, nlme, splines, survival
R (>= 2.9.0), MASS, nlme, splines, survival
R (>= 2.10.0), MASS, nlme, splines, survival
R (>= 2.11.0), MASS, nlme, splines, survival
R (>= 2.12.0), MASS, nlme, splines, survival
R (>= 2.14.0), MASS, nlme, splines, survival
R (>= 3.0.0), MASS, nlme, splines, survival