pqcor {PriceIndices}

Providing a correlation coefficient for price and quantity of sold products

Description

The function returns correlation between price and quantity of sold products with given IDs.

Usage

pqcor(data, period, set = c(), figure = FALSE)

Arguments

data

The user's data frame. It must contain columns: time (as Date in format: year-month-day,e.g. '2020-12-01'), prices (as positive numeric), 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 correlation between price and quantity of sold products (see also data_matching). If the set is empty, the function works for all products being available in period.

figure

A logical parameter indicating whether the function returns a figure (TRUE) or a data frame (FALSE) with correlations between price and quantity of sold products.

Value

The function returns Pearson's correlation coefficient between price and quantity of products with given IDs and sold in period.

Examples

pqcor(milk, period="2019-03")
pqcor(milk, period="2019-03",figure=TRUE)