Raw data often only contains values where they exist. This function expands the raw data so there are 0 values for periods that no counts existed. It also makes sure period and period_id are consistent between each specialty/trust combination
clean_raw_data.RdRaw data often only contains values where they exist. This function expands the raw data so there are 0 values for periods that no counts existed. It also makes sure period and period_id are consistent between each specialty/trust combination