Nonresponse bias can occur for various reasons, including: - Inaccessibility: Some individuals may not be reachable due to outdated contact information or lack of access to communication tools. - Refusal to Participate: Potential respondents may refuse to participate due to privacy concerns, lack of interest, or distrust in the research process. - Inability to Participate: Certain populations, such as those with severe illnesses or disabilities, may be unable to participate.
