see doc for dcc for details.
tc_efunc(chrono, climate, boot, sb, start_last, win_size, ci, method)
tree-ring chronology
data.frame with climate parameters
which bootstrapping method should be used? (or "none")
logical: draw statusbar or not?
logical: start with last (oldest) window?
numeric: size of the first window in years
numeric: p-level for confidence interval (must be in c(0.1, 0.05, 0.01)
character: method to be used (one of "response" or "correlation")