Definition: Rotational design
Rotational design refers to the sample selection based on a number of subsamples or replications, each of them similar in size and design and representative of the whole population. From one year to the next, some replications are retained, while others are dropped and replaced by new replications.
In the case of a rotational design based on four replications with a rotation of one replication per year, one of the replications shall be dropped immediately after the first year, the second shall be retained for two years, the third for three years, and the fourth shall be retained for four years. From the second year onwards, one new replication shall be introduced each year and retained for four years.
European Union, Commission Regulation (EC) No 1982/2003 of 21 October 2003 implementing Regulation (EC) No 1177/2003 of the European Parliament and of the Council concerning Community statistics on income and living conditions (EU-SILC) as regards the sampling and tracing rules