Field rules and bias in random surveys with quota samples : an assessment of CIS surveys
Pavía, Jose M. (Universitat de València. Departament de Matemàtiques)
Aybar, Cristina (Universitat de València. Departament de Matemàtiques)

Data:	2018
Resum:	Surveys applying quota sampling in their final step are widely used in opinion and market research all over the world. This is also the case in Spain, where the surveys carried out by CIS (a public institution for sociological research supported by the government) have become a point of reference. The rules used by CIS to select individuals within quotas, however, could be improved as they lead to biases in age distributions. Analysing more than 545,000 responses collected in the 220 monthly barometers conducted between 1997 and 2016 by CIS, we compare the empirical distributions of the barometers with the expected distributions from the sample design and/or target populations. Among other results, we find, as a consequence of the rules used, significant overrepresentations in the observed proportions of respondents with ages equal to the minimum and maximum of each quota (age and gender group). Furthermore, in line with previous literature, we also note a significant overrepresentation of ages ending in zero. After offering simple solutions to avoid all these biases, we discuss some of their consequences for modelling and inference and about limitations and potentialities of CIS data.
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Centre for sociological research ; Quota sampling ; Fieldwork rules ; Age and gender groups ; Inter-quota distributions ; Intra-quota distributions
Publicat a:	SORT : statistics and operations research transactions, Vol. 42 Núm. 2 (July-December 2018) , p. 183-206 (Articles) , ISSN 2013-8830

Adreça alternativa: https://raco.cat/index.php/SORT/article/view/347338
DOI: 10.2436/20.8080.02.74

24 p, 3.7 MB

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