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Brian Graf

Introduction 4.1 To construct a perfectly accurate consumer price index (CPI), the price statistician would need to record the price of every variety of all the goods and services that are in the scope of the CPI. Because it is too costly and, in practice, impossible to regularly record all the prices of the universe in a timely manner, sampling techniques are used to select a subset of prices that eventually enter the index compilation. Consequently, a CPI compilation is based on samples. 4.2 Sampling occurs on several different levels in the CPI

International Monetary Fund. Statistics Dept.

ing (MoU), for SD transmission. Several questions regarding content and data coverage need to be clarified. Additionally, since the supermarket product categorization is used in the classification process, Geostat should request the data providers to inform them in advance of any categorization changes, and moreover request the stability of the once agreed file structure. 4. Negotiations with other supermarket chains should continue to improve the coverage . Despite the limited market coverage, SD can still be introduced in the CPI compilation using turnover as