Calculates performance by period from a given data set and target stock

Usage

calc_shortfall(incompletes_data, target_bin = 4, target_performance = 0.92)

Arguments

incompletes_data: tibble; requires column headers of "period", "months_waited_id" and "value", where value is the count of incomplete pathways by period and the number of months the patients have waited
target_bin: integer; the number of months waited where patients that have waited for greater or equal to that number of months have breached performance
target_performance: numeric of length 1; must be between 0 and 1. The value is the number of patients on the waiting list that have waited for less than the `target_bin` time, as a proportion of the total waiting list

Value

A two column tibble containing "period" and "shortfall" columns, where shortfall is the number of additional patients that are on the waiting list and have been waiting longer than the `target_bin` length that, if removed, will results in a performance equal to the `target_performance`