Function for computing the index for a forecast system vs. climatological forecast. You must provide an indexclim object.
indexfore(score_fore, clim)
the time serie of the ensemble forecast's CRPS/MAE. Be careful that score_fore is consistent with "score" in indexclim
an indexclim object coming from indexclim
an indexfore object with the index computed vs. climatological forecast and the statistic omega2