Compute accuracy statistics
Arguments
- forecasts
 A fable object with forecasts, usually the output from
get_forecasts- actuals
 A tsibble with actual values. For example, the output from
read_tac_data
Compute accuracy statistics
A fable object with forecasts, usually the output from get_forecasts
A tsibble with actual values.  For example, the output from read_tac_data