This data set is to test interval censoring.  It has 2 left censored, 14
right censored, 2 exact and 8 interval censored observations, grafted onto
covariates from the ovarian data set.
"ltime","rtime","age","resid.ds","rx","ecog.ps"
"1",NA,150,72.3315,2,1,1
"2",NA,150,74.4932,2,1,1
"3",146,166,66.4658,2,1,2
"4",421,NA,53.3644,2,2,1
"5",421,421,50.3397,2,1,1
"6",448,NA,56.4301,1,1,2
"7",454,474,56.937,2,2,2
"8",465,485,59.8548,2,2,2
"9",477,NA,64.1753,2,1,1
"10",553,573,55.1781,1,2,2
"11",628,648,56.7562,1,1,2
"12",744,NA,50.1096,1,2,1
"13",769,NA,59.6301,2,2,2
"14",770,NA,57.0521,2,2,1
"15",803,NA,39.2712,1,1,1
"16",855,NA,43.1233,1,1,2
"17",1040,NA,38.8932,2,1,2
"18",1106,NA,44.6,1,1,1
"19",1129,NA,53.9068,1,2,1
"20",1206,NA,44.2055,2,2,1
"21",1227,NA,59.589,1,2,2
"22",258,278,74.5041,2,1,2
"23",319,339,43.137,2,1,1
"24",343,363,63.2192,1,2,2
"25",375,375,64.4247,2,2,1
"26",377,NA,58.3096,1,2,1