The function returns quantities of sold products with given IDs.
Usage
quantities(data, period, set = c())
Value
The function analyzes the user's data frame and returns quantities of products with given ID and being sold in the time period indicated by the period parameter.
Arguments
data
The user's data frame. It must contain columns: time (as Date in format: year-month-day, e.g. '2020-12-01'), quantities (as positive numeric) and prodID (as numeric, factor or character) with unique product IDs.
period
The time period (as character) limited to the year and month, e.g. "2019-03".
set
The set of unique product IDs to be used for determining quantities of sold products (see also data_matching). If the set is empty, the function returns quantities of all products being available in period.