Displaying 1 result from an estimated 1 matches for "date_1st_ev".
2010 Sep 06
3
Finding the two most recent dates
Dear R help,
I have the following data frame:
structure(list(prochi = c("ind_1", "ind_1", "ind_1",
"ind_1", "ind_1", "ind_1", "ind_1", "ind_1",
"ind_1", "ind_1"), date_1st_event = structure(c(14784,
14784, 14784, 14784, 14784, 14784, 14784, 14784, 14784, 14784
), class = "Date"), bp_date = structure(c(12660, 14571, 13392,
13080, 12012, 13080, 13894, 14622, 12654, 13894), class = "Date"),
SBP = c(135L, 160L, 135L, 153L, 150L, 153L, 151L, 126L,...