Methodology: sampling design
The sample of the European Quality of Life Survey is representative of the adult persons who were living in private households during the fieldwork period in each of the countries covered.
In most of the countries, the EQLS sample followed a multi-stage, stratified and clustered design with a ‘random walk’ procedure for the selection of the households at the last stage (with the exception of Netherlands, Sweden and Norway where the selection of the respondents was made using phone registers and Malta and Belgium where all respondents were randomly selected from the population register).
The sampling selection process was random at each stage, i.e. the selection of primary sampling units, the selection of addresses, the selection of households and the selection of individuals aged 18 and over. Only one person from the same household was interviewed.