Długość kwestionariusza a precyzja odpowiedzi na pytania ilościowe w badaniach ankietowych
Length of the Questionnaire and the Precision of Response to Quantitative Questions in Surveys

Summary/Abstract: The features of the questionnaire, such as its length, difficulty, or subjectively perceived curiosity, have a direct effect on the quality of survey data received. The author analyses the relationship between the length of the questionnaire and the precision of quantitative data obtained in a survey, using survey data on wage income distribution in the Polish households, collected by the Central Statistical Office. The research is based on a natural quasi- experiment provided by raising the number of questions asked between 2005 and 2006. The author analyses the impact of this change on the dispersion of incomes declared by the respondents. The results show a negative relationship between the length of the questionnaire and the precision of the responses obtained (questions that have been shifted to further places in the questionnaire yield less precise answers). The results are relatively robust against the impact of other factors.

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