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    Wyświetlanie 1-2 z 2
    Tytuł:
    Scanner data and the problem of selecting a price index formula
    Autorzy:
    Białek, Jacek
    Powiązania:
    https://bibliotekanauki.pl/articles/30120607.pdf
    Data publikacji:
    2023
    Wydawca:
    Instytut Naukowo-Wydawniczy "SPATIUM"
    Tematy:
    scanner data
    Consumer Price Index
    bilateral indices
    multilateral indices
    Opis:
    Scanner data are electronic transaction data most often from retail chains and obtained from electronic retail terminals. The identification of products takes place after scanning their characteristic barcode (e.g. EAN or GTIN), thus in the case of scanner data, we have full product information (price, sales volume, weight, description, etc.) at the most disaggregated level. In the cases of many countries, as well as Poland, this type of data is a valuable alternative source of information when estimating inflation. This paper discusses the main advantages but also the challenges of using scanner data in the CPI measurement. The main purpose of the paper, however, is to discuss the problem of selecting an optimal price index formula that would be appropriate for the highly dynamic (in terms of product rotation) scanner data. The considerations, supported by examples of empirical studies, will be demonstrated using the PriceIndices package in the R environment.
    Źródło:
    Central European Review of Economics & Finance; 2023, 44, 3; 5-20
    2082-8500
    2083-4314
    Pojawia się w:
    Central European Review of Economics & Finance
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Quality adjusted GEKS-type indices for price comparisons based on scanner data
    Autorzy:
    Białek, Jacek
    Powiązania:
    https://bibliotekanauki.pl/articles/18105175.pdf
    Data publikacji:
    2023-06-13
    Wydawca:
    Główny Urząd Statystyczny
    Tematy:
    scanner data
    product classification
    product matching
    Consumer Price Index
    multilateral indices
    GEKS index
    Opis:
    A wide variety of retailers (supermarkets, home electronics, Internet shops, etc.) provide scanner data containing information at the level of the barcode, e.g. the Global Trade Item Number (GTIN). As scanner data provide complete transaction information, we may use the expenditure shares of items as weightsfor calculating price indices at the lowest (elementary) level of data aggregation. The challenge here is the choice of the index formula which should be able to reduce chain drift bias and substitution bias. Multilateral index methods seem to be the best choice due to the dynamic character of scanner data. These indices work on a wholetime window and are transitive, which is key to the elimination of the chain drift effect. Following what is called an identity test, however, it may be expected that even when only prices return to their original values, the index becomes one. Unfortunately, the commonly used multilateral indices (GEKS, CCDI, GK, TPD, TDH) do not meet the identity test. The paper discusses the proposal of two multilateral indices and their weighted versions. On the one hand, the design of the proposed indices is based on the idea of the GEKS index. On the other hand, similarly to the Geary-Khamis method, it requires quality adjusting. It is shown that the proposed indices meet the identity test and most other tests. In an empirical and simulation study, these indices are compared with the SPQ index, which is relatively new and also meets the identity test. The analytical considerations as well as empirical studies confirm the high usefulness of the proposed indices.
    Źródło:
    Statistics in Transition new series; 2023, 24, 3; 151-169
    1234-7655
    Pojawia się w:
    Statistics in Transition new series
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-2 z 2

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