chgeowalsh: Calculating the monthly chained geometric Walsh price index

In PriceIndices: Calculating Bilateral and Multilateral Price Indexes

Calculating the monthly chained geometric Walsh price index

Description

This function returns a value (or vector of values) of the monthly chained geometric Walsh price index

Usage

chgeowalsh(data, start, end, interval = FALSE)

Arguments

data	The user's data frame with information about sold products. It must contain columns: time (as Date in format: year-month-day,e.g. '2020-12-01'), prices (as positive numeric) and prodID (as numeric, factor or character). A column quantities (as positive numeric) is also needed because this function uses unit values as monthly prices.
start	The base period (as character) limited to the year and month, e.g. "2020-03".
end	The research period (as character) limited to the year and month, e.g. "2020-04".
interval	A logical value indicating whether the function is to compare the research period defined by end to the base period defined by start (then interval is set to FALSE) or all fixed base indices are to be calculated. In this latter case, all months from the time interval <start,end> are considered and start defines the base period (interval is set to TRUE).

Value

The function returns a value (or vector of values) of the monthly chained geometric Walsh price index depending on the interval parameter. If the interval parameter is set to TRUE, the function returns a vector of price index values without dates. To get information about both price index values and corresponding dates, please see functions: price_indices or final_index. The function does not take into account aggregating over outlets or product subgroups (to consider these types of aggregating, please use the final_index function).

References

Walsh, C.M. (1901). The Measurement of General Exchange Value. New York: Macmillan and Co., p.202

Walsh, C.M. (1921). The Problem of Estimation. London: P.S. King & Son, p.97

Examples

chgeowalsh(sugar, start="2018-12", end="2019-04")
chgeowalsh(milk, start="2018-12", end="2020-01", interval=TRUE)

PriceIndices documentation built on Feb. 26, 2026, 1:07 a.m.