## errors.forecast_errors()


Calculate forecast accuracy measures for a single metric/area/fold.


Usage

``` python
errors.forecast_errors(
    forecast,
    horizon=None,
)
```


Measures included:

- RMSE (root mean squared error)
- MASE (mean absolute scaled error)
- sMAPE (symmetric mean absolute percentage error)
- Coverage (prediction interval coverage)


## Parameters


`forecast: pd.DataFrame`  
Forecast results.

`horizon: int | None = None`  
Number of forecast days to include. If None, uses the full forecast.


## Returns


`dict`  
Dictionary of forecast accuracy measures.