Missing Data

• When the respondent has decided not to answer a question

because it is inappropriate or because the respondent has personal

reasons for not doing so.

1. Think carefully about whether all questions are appropriate

2. Save respondents from embarrassing situations.

• When the respondent forgot to answer the question or completely

missed an entire page of the questionnaire.

1. Test the research procedure before you carry out it

2. Check the respondents answers before they leaves

• When the research requires the respondents to participate in it

at more than one time.

Attrition Problem

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