importFrom("grDevices", "colours", "devAskNewPage")
importFrom("graphics", "filled.contour", "matplot", "persp")
importFrom("stats", "as.formula", "na.exclude", "terms")
importFrom("survival", "coxph", "survfit")
exportPattern("^[^\\.]")
S3method(plot, p3state)
S3method(summary, p3state)
