View source: R/f_bilateral_indices.R
geary_khamis | R Documentation |
This function returns a value (or vector of values) of the bilateral Geary-Khamis price index.
geary_khamis(data, start, end, interval = FALSE)
data |
The user's data frame with information about sold products. It must contain columns: |
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 |
The function returns a value (or vector of values) of the bilateral Geary-Khamis price index depending on the interval
parameter (please use gk
function to calculate the multilateral Geary-Khamis price index). 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).
Geary, R. G. (1958). A Note on Comparisons of Exchange Rates and Purchasing Power between Countries. Journal of the Royal Statistical Society, Series A, 121, 97-99.
Khamis, S. H. (1970). Properties and Conditions for the Existence of a new Type of Index Number. Sankhya Series B32, 81-98.
(2004). Consumer Price Index Manual. Theory and practice. ILO/IMF/OECD/UNECE/Eurostat/The World Bank, International Labour Office (ILO), Geneva.
Von der Lippe, P. (2007). Index Theory and Price Statistics. Peter Lang: Berlin, Germany.
geary_khamis(sugar, start="2018-12", end="2019-12")
geary_khamis(milk, start="2018-12", end="2020-01", interval=TRUE)
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