aerr_sf                 Absolute error scoring function
aperr_sf                Absolute percentage error scoring function
bmedian_sf              beta-median scoring function
bregman1_sf             Bregman scoring function (type 1)
bregman2_sf             Bregman scoring function (type 2, Patton
                        scoring function)
bregman3_sf             Bregman scoring function (type 3, QLIKE scoring
                        function)
bregman4_sf             Bregman scoring function (type 4, Patton
                        scoring function)
capping_function        Capping function
expectile_sf            Asymmetric piecewise quadratic scoring function
                        (expectile scoring function)
ghuber_sf               Generalized Huber scoring function
gpl1_sf                 Generalized piecewise linear scoring function
                        (type 1)
gpl2_sf                 Generalized piecewise linear scoring function
                        (type 2)
huber_sf                Huber scoring function
maelog_sf               MAE-LOG scoring function
maesd_sf                MAE-SD scoring function
obsweighted_sf          Observation-weighted scoring function
quantile_sf             Asymmetric piecewise linear scoring function
                        (quantile scoring function)
relerr_sf               Relative error scoring function (MAE-PROP
                        scoring function)
serr_sf                 Squared error scoring function
sperr_sf                Squared percentage error scoring function
srelerr_sf              Squared relative error scoring function
