Generate new data from a fable model

Simulates future paths from a dataset using a fitted model. Innovations are sampled by the model's assumed error distribution. If bootstrap is TRUE, innovations will be sampled from the model's residuals. If new_data contains the .innov column, those values will be treated as innovations.

# S3 method for ARIMA
generate(x, new_data, specials, bootstrap = FALSE, ...)

Arguments

x

A fitted model.

new_data

A tsibble containing the time points and exogenous regressors to produce forecasts for.

specials

(passed by fabletools::forecast.mdl_df()).

bootstrap

If TRUE, then forecast distributions are computed using simulation with resampled errors.

...

Other arguments passed to methods

See also

fabletools::generate.mdl_df

Examples

fable_fit <- as_tsibble(USAccDeaths) %>%
  model(model = ARIMA(value ~ 0 + pdq(0,1,1) + PDQ(0,1,1)))
fable_fit %>% generate(times = 10)
#> # A tsibble: 240 x 4 [1M]
#> # Key:       .model, .rep [10]
#>    .model .rep     index   .sim
#>    <chr>  <chr>    <mth>  <dbl>
#>  1 model  1     1979 Jan  8239.
#>  2 model  1     1979 Feb  8186.
#>  3 model  1     1979 Mar  8329.
#>  4 model  1     1979 Apr  8408.
#>  5 model  1     1979 May  8900.
#>  6 model  1     1979 Jun  9992.
#>  7 model  1     1979 Jul 11007.
#>  8 model  1     1979 Aug 10748.
#>  9 model  1     1979 Sep  9502.
#> 10 model  1     1979 Oct 10566.
#> # ℹ 230 more rows