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Non-sampling Errors Two factors determine the quality of data collection process: Field Worker/ Interviewer and Respondent. 1. Intentional Field Worker Errors -Cheating Control Mechanisms: Good questionnaire, Reasonable work expectation, Supervision, Random checks
-Leading respondent Control Mechanisms: Validation
2. Unintentional Field Worker Errors -Interviewer Characteristics Misunderstandings Control Mechanisms: Selection and training of interviewers , Orientation sessions and role playing
-Fatigue Control Mechanisms: Reasonable questionnaires quota, breaks and alternate surveys
3. Intentional Respondent Errors -Non-response Control Mechanisms: Assuring anonymity and confidentiality, incentives, third person technique, reasonable questionnaire length
-Falsehoods Control Mechanisms: Assuring anonymity and confidentiality, Incentives, Validation checks, third person technique, reasonable questionnaire length
4. Unintentional Respondent Errors - Misunderstandings Control Mechanisms: Well-drafted questionnaire, clear questions and responses options
-Guessing Control Mechanisms: Response options (e.g., “unsure”)
-Attention loss, Distractions Control Mechanisms: Reversal of scale endpoints, Cards
-Fatigue Control Mechanisms: Well-drafted questionnaire, Cards, Reasonable Questionnaire length
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