MAE                     MEAN ABSOLUTE ERRORS (MAE)
MAPE                    MEAN ABSOLUTE PERCENTAGE ERROR (MAPE)
MSE                     MEAN SQUARED ERRORS (MSE)
SSE                     SUM of SQUARED ERRORS (SSE)
SpainMap                Spain National map information
SpainNat                Spain National Mortality data
SpainRegions            Spain Regions Mortality data
fit_additive.LC.multi   FUNCTION TO FIT ADDITIVE MULTI-POPULATION
                        MORTALITY MODEL
fit_multiplicative.LC.multi
                        FUNCTION TO FIT MULTIPLICATIVE MULTI-POPULATION
                        MORTALITY MODEL
for_additive.LC.multi   FUNCTION TO FORECAST ADDITIVE MULTI-POPULATION
                        MORTALITY MODEL
for_multiplicative.LC.multi
                        FUNCTION TO FORECAST MULTIPLICATIVE
                        MULTI-POPULATION MORTALITY MODEL
multipopulation_cv      FUNCTION TO APPLY CROSS-VALIDATION TECHNIQUES
                        FOR TESTING THE FORECASTING ACCURACY OF
                        MULTI-POPULATION MORTALITY MODELS
multipopulation_loocv   FUNCTION TO APPLY LEAVE-ONE-OUT
                        CROSS-VALIDATION TECHNIQUE FOR TESTING THE
                        FORECASTING ACCURACY OF MULTI-POPULATION
                        MORTALITY MODELS
plotLC.multi            FUNCTION TO PLOT MULTI-POPULATION MORTALITY
                        MODEL
regions                 regions
