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Using Scanner Data to Construct CPI Basic Component Indexes

  • Reinsdorf, Marshall B
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    This article considers how scanner data could be used in constructing component indexes for the U.S. Consumer Price Index. One product, coffee, in two cities generates over 1.8 million observations in just over two years, so coping with the sheer volume of data would be a challenge. Some other findings are (1) some aggregation of prices into 'unit-value' averages is necessary for practical reasons and to avoid bias, (2) chained Laspeyres indexes are very high, (3) 'modified' Laspeyres indexes have some upward bias but much less than a true Laspeyres index, (4) Fisher ideal or modified Edgeworth indexes perform well, and (5) aggregating prices across outlets to form city-level unit values reduces the discrepancies between index-number formulas.

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    Article provided by American Statistical Association in its journal Journal of Business and Economic Statistics.

    Volume (Year): 17 (1999)
    Issue (Month): 2 (April)
    Pages: 152-60

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    Handle: RePEc:bes:jnlbes:v:17:y:1999:i:2:p:152-60
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