rolling_horizon: Rolling horizon
In alexanderharms/timsR: A testing setup for time series analysis.

Test time series models with the rolling horizon method.

1 2	rolling_horizon(series, FUN, FUN_PRED, start_eval, eval_periods = 4, h = 14, regressors = NULL)

`series`	Time series of the target variable.
`FUN`	Training function, returns a model-object.
`FUN_PRED`	Prediction function, returns a prediction.
`start_eval`	Vector in the shape c(year, period) that form the last point of the first rolling horizon.
`eval_periods`	Number of rolling horizons.
`h`	Horizon length.