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Food hygiene --- Food hygiene --- Consumer behaviour --- Consumer behaviour --- Consumer surveys --- Consumer surveys

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Foods. --- Product labelling. --- Consumer behaviour. --- Consumer surveys. --- Scandinavia. --- Levnedsmidler, fødevarer. --- Varemærkning. --- Forbrugeradfærd. --- Forbrugerundersøgelser. --- Skandinavien, Norden. --- Biovidenskab

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foods --- Commodity markets --- Self sufficiency --- home economics --- Consumer surveys --- Farm surveys --- Market research --- Income --- social welfare --- Poverty --- food security --- Lao People's Democratic Republic

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The response to a survey will never be 100%, nor will it be completely non-selective. This causes a bias in statistics based on survey research. In this PhD-thesis written by Fannie Cobben various methods for the treatment of nonresponse in sample surveys are described. Persons that do not participate in survey research often do so for different reasons. For example, persons that cannot be contacted during the fieldwork often have different reasons not to respond than persons that refuse participation because they are not interested in the survey topic. When analysing nonresponse, and also when adjusting for nonresponse bias, it is important to distinguish between different types of respondents. In this thesis, a number of methods are described that account for different response types. A higher response rate is not necessarily better. It is also important to look at the balance of characteristics in the response. Therefore, an indicator for the quality of survey response has been d eveloped; the Representativeness-indicator or R-indicator. The R-indicator displays how balanced the composition of the response is compared to the composition of the target population, with respect to certain characteristics such as ethnicity or age. In dit proefschrift worden methoden voor het omgaan met non-respons in survey onderzoek voor personen en huishoudens besproken. Wanneer een persoon wordt geselecteerd voor deelname aan een survey, kunnen er twee situaties optreden: ofwel er wordt medewerking verkregen en de persoon respondeert, ofwel er wordt niet meegewerkt aan het onderzoek wat leidt tot non-respons. Er zijn echter verschillende redenen voor het niet responderen. Personen die niet bereikt kunnen worden tijdens de veldwerkperiode hebben vaak andere redenen om niet mee te doen dan personen die deelname aan het onderzoek weigeren. Dit leidt tot verschillende typen non-respondenten. De traditionele methoden voor het analyseren van non-respons en de correctie van non-respons vertekening houden hiermee geen rekening. In dit proefschrift worden methoden ontwikkeld die de verschillende typen respondenten onderscheiden.

Données statistiques. --- Enquêtes. --- Méthodologie. --- Nonresponse (Statistics). --- Social surveys --- Methodology --- Methodology. --- Response rate --- Response rate. --- Netherlands. --- #SBIB:303H30 --- #SBIB:303H32 --- Kwalitatieve methoden: algemeen --- Waarneming en participerende waarneming, gecontroleerde observatie, groepsdiscussie (vragenlijsten, interviews, experimenten) --- statistiek --- statistics --- statistische analyse --- statistical analysis --- gegevensverwerking --- data processing --- consumentenonderzoeken --- consumer surveys --- monsterverwerking --- sample processing --- Statistical Analysis --- Statistische analyse