summary.MackChainLadder gives a list of two elements back
ByOrigindata frame with Latest (latest actual claims costs),
Dev.To.Date (chain-ladder development to date),
Ultimate (estimated ultimate claims cost), IBNR
(estimated IBNR), Mack.S.E (Mack's estimation of the standard
error of the IBNR), and CV(IBNR) (Coefficient of Variance=Mack.S.E/IBNR)
Totalsdata frame of totals over all origin periods. The items
follow the same naming convention as in ByOrigin above