Prepare a tsibble of announcement counts by source and month

Convert a data.table of job announcements into a tsibble keyed by data source (fonte) and indexed by year-month, counting unique announcements per source per month.

Usage

prepare_source_tsibble(ann)

Arguments

ann

A data.table of announcements. Must contain columns general_id and source. Also requires either a gdate column (IDate) or the raw year/month/day columns used by parse_ymd_columns().

Value

A tsibble with key fonte, index mese (yearmonth) and column N (unique announcement count per source-month).