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Paul McDonald - Product Lead
Long questionnaires result in lower response rates.Effects of Questionnaire length on Participation and Indicators of Response Quality in a web survey (Galesic, Bosnjak 2009)
Long questionnaires lead to reduced response quality and increased straightliners.Effects of Questionnaire Length on Response Quality(Herzog, Bachman 1981)
Matrices/grid formats introduce measurement error and are more difficult for respondents.Presentation of a Single Item versus a Grid: Effects on the Vitality and Mental Health Scales of the SF-36v2 Health Survey (Callegaro, Shand-Lubbers, Dennis 2009)
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