MAE
(Mean Absolute Error) or SMAPE
(Symmetric Mean Absolute Percentage Error). Depending on business needs, forecasts can be made for different time frames and aggregation levels, such as:
order_id
(Primary Key)
item_id
(Foreign Key referencing Items)
buyer_id
(Foreign Key referencing Buyers)
group_id
(Foreign Key referencing Groups)
event_id
(Foreign Key referencing Events)
timestamp
(Date and time of the sale)
quantity
(Number of items sold)
item_id
(Primary Key)group_id
(Primary Key)buyer_id
(Primary Key)event_id
(Primary Key)
timestamp
(Date and time of the event)