select levels of factor variables
On May 25, 2011, at 4:46 AM, zoe.cryocla wrote:
Hi again, I've got another question... I often use the symbol == to select some levels of factor variables like : data[data$var=="blabla", [ But this time, I'd like to select all the levels of my variable wich contain the letter "B", is that a way to determine this conditions ?
Perhaps with grep and/or %in% Got a reproducible example? ...preferably constructed with dput
David Winsemius, MD West Hartford, CT