search for: era3end

...es, do the variable construction, and then rbind the subsets back together. Here's part of the code I used: read001 <- read[read$existstr=="001",] read001$era1end <- NA read001$era2base <- NA read001$era2end <- NA read001$era3base <- read001$era1base read001$era3end <- read001$era3base + (6 * read001$era3tr) read011 <- read[read$existstr=="011",] read011$era1end <- NA read011$era2base <- read011$era1base read011$era2end <- read011$era2base + (4 * read011$era2tr) read011$era3base <- read011$era2end read011$era3end <- r...