Editing World Values Survey (section)

===Sampling===
Samples are drawn from the entire population of 18 years and older. The minimum sample is 1000. In most countries, no upper age limit is imposed and some form of stratified random [[sampling (statistics)|sampling]] is used to obtain representative national samples. In the first stages, a random selection of sampling points is made based on the given society statistical regions, districts, census units, election sections, [[electoral roll]] or [[polling place]] and central population registers. In most countries the population size and/or degree of [[urbanization]] of these Primary Sampling Units are taken into account. In some countries, individuals are drawn from national registers.{{Sfn | Esmer | 2004 | p = 390}}