Dear R users. I am trying to program the comp() routine in package survMisc. I am reading the data below with d=read.table( "C:\\. . .",fill=TRUE,header=TRUE) Then I load the packages 'survival' and 'survMisc', library(survival), library(survMisc) and I run the commands s=survfit(Surv(d[,2], d[,3])~d[,1], data=d) comp(s) and I am getting the error Error in get(t1, loc1) : object 'd[, 2]' not found If instead I use the commands s=survfit(Surv(T, Status)~Group, data=d) comp(s) routine comp() runs perfectly. However when I am programing I can't see a way to know in advance the variable names in order to use them. Can anybody give me a suggestion? Thanks in advance Endy NB. The data must be stacked in three (3) columns before red. They are repeated in nine (9) columns for space saving. Group T Status Group T Status Group T Status 1 2081 0 1 55 1 2 414 1 1 1602 0 1 1 1 2 2204 1 1 1496 0 1 107 1 2 1063 1 1 1462 0 1 110 1 2 481 1 1 1433 0 1 332 1 2 105 1 1 1377 0 2 2569 0 2 641 1 1 1330 0 2 2506 0 2 390 1 1 996 0 2 2409 0 2 288 1 1 226 0 2 2218 0 2 421 1 1 1199 0 2 1857 0 2 79 1 1 1111 0 2 1829 0 2 748 1 1 530 0 2 1562 0 2 486 1 1 1182 0 2 1470 0 2 48 1 1 1167 0 2 1363 0 2 272 1 1 418 1 2 1030 0 2 1074 1 1 383 1 2 860 0 2 381 1 1 276 1 2 1258 0 2 10 1 1 104 1 2 2246 0 2 53 1 1 609 1 2 1870 0 2 80 1 1 172 1 2 1799 0 2 35 1 1 487 1 2 1709 0 2 248 1 1 662 1 2 1674 0 2 704 1 1 194 1 2 1568 0 2 211 1 1 230 1 2 1527 0 2 219 1 1 526 1 2 1324 0 2 606 1 1 122 1 2 957 0 1 129 1 2 932 0 1 74 1 2 847 0 1 122 1 2 848 0 1 86 1 2 1850 0 1 466 1 2 1843 0 1 192 1 2 1535 0 1 109 1 2 1447 0 1 55 1 2 1384 0 [[alternative HTML version deleted]]