Definition
A region is a subnational administrative unit comprising of several provinces having more or less homogenous characteristics, such as ethnic origin of inhabitants, dialect spoken, agricultural produce, and others.
The Philippines is divided into 17 regions, eight of which are in Luzon, six in Mindanao, and only three in the Visayas.
The sampling design used this geographic area level as the Domain. The coding system used here is for the new regional composition. i.e., Census 2000 Regional Composition.