Sampling and representativity
Article 4
1. Member States shall make a target sample that is representative of the target universe by defining elementary aggregates and selecting individual products for these elementary aggregates. 2. The number of individual products and elementary aggregates shall depend on the weight of the subclass and the variance of price movements of the individual products belonging to it. 3. Member States shall ensure that the target sample remains representative of the target universe over time by conducting at least an annual review and update of the target sample, and selecting replacement products. 4. Products for which the expenditure share is at least one part per thousand shall be represented in the target sample.