PPS Sampling with Panel Rotation for Service Price Indices
Description of a new sampling design for price indices on services
In the last decade, Statistics Netherlands (SN) has started publishing service producer price indices (SPPI) for a range of service types. To this end, quarterly price mutations are measured in a panel survey of enterprises. In this paper, we present a redesign for the Dutch SPPI which is based on a probability proportional to size (PPS) sampling design, with turnover used as a size variable.
In this redesign, we accounted for three ‘non-standard’ issues. Firstly, SN does not have a sampling frame of services. Secondly, we addressed the allocation of the sample over different NACE codes. Finally, we wanted to design a rotating PPS panel, also accounting for births and deaths in the population, while still obtaining approximately unbiased estimators.