View source: R/f_extensions_multilateral_indices.R
geksgaqi_fbew | R Documentation |
This function returns a value of the multilateral GEKS-GAQI price index extended by using the FBEW (Fixed Base Monthly Expanding Window) method.
geksgaqi_fbew(data, start, end)
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. "2019-12". |
end |
The research period (as character) limited to the year and month, e.g. "2020-04". |
This function returns a value of the multilateral GEKS-GAQI price index (the GEKS index based on the geometric asynchronous quality adjusted price index formula) extended by using the FBEW (Fixed Base Monthly Expanding Window) method. The FBEW method uses a time window with a fixed base month every year (December). The window is enlarged every month with one month in order to include information from a new month. The full window length (13 months) is reached in December of each year. The function measures the price dynamics between periods end
and start
. The month of the start
parameter must be December. If the distance between end
and start
exceeds 13 months, then internal Decembers play a role of chain-linking months. 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).
Gini, C. (1931). On the Circular Test of Index Numbers. Metron 9:9, 3-24.
Elteto, O., and Koves, P. (1964). On a Problem of Index Number Computation Relating to International Comparisons. Statisztikai Szemle 42, 507-518.
Szulc, B. (1983). Linking Price Index Numbers. In: Price Level Measurement, W. E. Diewert and C. Montmarquette (eds.), 537-566.
Chessa, A.G. (2016). A New Methodology for Processing Scanner Data in the Dutch CPI. Eurona 1/2016, 49-69.
geksgaqi_fbew(milk, start="2018-12", end="2019-08")
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.