Definition of Selection Bias
Selection bias is a type of error that occurs when the sample of participants in a qualitative research study is not representative of the population or phenomenon of interest. This can lead to inaccurate or misleading findings that do not reflect the reality or diversity of the research topic.
Example: Let's consider a qualitative research study aiming to explore people's attitudes towards public transportation usage in a city. The researcher decides to conduct interviews at a central transit station during the morning rush hour. However, this selection bias might result in overrepresenting the opinions of commuters who regularly use public transportation, while neglecting the perspectives of those who do not use it as regularily or have alternative commuting arrangements. These neglectec perspectives may have a very different experience at times when the vehicles are less crowded and usually are subject to different ticketing price structures compared to a monthly ticket.