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Extract metadata from raw data, either by reference or by report date. For the target date chosen (reference or report), confirm, max_confirm``, and cum_prop_reported` are dropped and the first observation for each group and date is retained.


enw_metadata(obs, target_date = c("reference_date", "report_date"))



A data.frame or data.table with columns: reference_date and / or report_date; at least one must be provided, .group, a grouping column and a date, a Date column.


A character string, either "reference_date" or "report_date". The column corresponding to this string will be used as the target date for metadata extraction.


A data.table with columns:

  • date, a Date column

  • .group, a grouping column

and the first observation for each group and date. The data.table is sorted by .group and date.


obs <- data.frame(
  reference_date = as.Date("2021-01-01"),
  report_date = as.Date("2022-01-01"), x = 1:10
enw_metadata(obs, target_date = "reference_date")
#> Key: <.group, date>
#>          date .group     x
#>        <Date>  <num> <int>
#> 1: 2021-01-01      1     1