Description of node <>

Subject Predicate Object <p>Data is collected by CAPI (computer-assisted data collection), with the visit of an interviewer for the first and last waves for each dwelling, and by CATI (telephone) for other intermediate waves.<br /> If a person cannot respond (or does not want to), another person from the same household can answer in their  place.<br /> The survey is conducted continuously, every week of the year.The same dwelling is surveyed six times (the different waves of surveys are spaced with intervals of exactly three months).Survey results are published quarterly or annually.</p>