Takes output of enw_preprocess_data() and returns a new
preprocessed dataset with max_delay = 1, suitable for
retrospective Rt estimation without delay modelling.
Observations are taken at the specified delay (or the latest
available) and treated as final counts. In the returned data,
report_date is set equal to reference_date for all rows
(i.e. all observations appear to be reported on the same day
they occurred).
Arguments
- data
Output of
enw_preprocess_data().- max_delay
Integer delay at which to freeze observations. If
NULL(default), the latest available observation for each reference date is used.
Value
A preprocessed data object (as from
enw_preprocess_data()) with max_delay = 1.
See also
Preprocessing functions
enw_add_delay(),
enw_add_max_reported(),
enw_add_metaobs_features(),
enw_assign_group(),
enw_complete_dates(),
enw_construct_data(),
enw_extend_date(),
enw_filter_delay(),
enw_filter_reference_dates(),
enw_filter_reference_dates_by_report_start(),
enw_filter_report_dates(),
enw_flag_observed_observations(),
enw_impute_na_observations(),
enw_latest_data(),
enw_metadata(),
enw_metadata_delay(),
enw_missing_reference(),
enw_obs_at_delay(),
enw_preprocess_data(),
enw_reporting_triangle(),
enw_reporting_triangle_to_long()
Examples
pobs <- enw_example("preprocessed")
enw_retrospective(pobs)
#> ── Preprocessed nowcast data ───────────────────────────────────────────────────
#> Groups: 1 | Timestep: day | Max delay: 1
#> Observations: 40 timepoints x 40 snapshots
#> Max date: 2021-08-22
#>
#> Datasets (access with `enw_get_data(x, "<name>")`):
#> obs : 40 x 7
#> new_confirm : 40 x 9
#> latest : 40 x 8
#> missing_reference : 0 x 4
#> reporting_triangle : 40 x 3
#> metareference : 40 x 7
#> metareport : 40 x 10
#> metadelay : 1 x 5