search for: v1date

...ups of 4 (ie no visit date, and no value for the 3 variables) and are ignored. Eventually I have to determine mean time to resolution, mean follow-up time, etc and I think I can do that, but the first part is a bit beyond my coding skill. Suggestions appreciated. tC <- textConnection(" ID V1Date V1a V1b V1c V2date V2a V2b V2c V3date V3a V3b V3c 001 4/5/12 Yes Yes No 6/18/12 Yes No Yes NA NA NA NA 002 1/22/12 No No Yes 7/5/12 Yes No Yes NA NA NA NA 003 4/5/12 Yes No No 9/4/12 Yes No Yes 11/1/12 Yes No Yes 004 8/18/12 Yes Yes Yes 9/22/12 Yes No Yes NA NA NA NA 005 9/6/12 Yes No No NA NA NA N...