Using Scanner Data to Improve the Quality of Measurement in the Consumer Price Index
Using Scanner Data to Improve the Quality of Measurement in the Consumer Price Index
This chapter employs scanner data for price measurement of ice cream. Using scanner or other electronic point-of-sale (EPOS) data in consumer price indexes (CPIs) produce more data and, consequently, less variance, better data and, consequently, less bias, as well as better methods. Scanner data offer a veritable library of information relating to individual item elasticities and cross-elasticities. Direct adjustment, manufacturer's cost adjustment, hedonic adjustment, and characteristic-based subgroups are employed to adjust the quality changes in the CPI framework, or the quality differences in an inter-area price comparison framework. One of the thirty-four “scannable edible” item strata for which separate price indexes are computed in the CPI is “ice cream and related products.” Dividing “ice cream and related items” into four separate modules would lead in a moderate reduction in variance in measuring year-to-year change at the item stratum level, since the subgroups differ among themselves in their year-to-year change.
Keywords: scanner data, consumer price index, price measurement, ice cream, direct adjustment, cost adjustment, hedonic adjustment
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