When respondents don't answer a question on a survey honestly or completely because they feel the information is too personal or embarrassing, the question is suffering from social desirability bias.

Question

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Social desirability bias occurs when respondents are more likely to provide answers they believe are socially acceptable or desirable, rather than their true beliefs or behavior. This is often the case with sensitive or personal questions that people may feel uncomfortable answering honestly.

When Respondents Don't Answer a Question on a Survey Honestly