Qualitative Methods Questions Long
Purposive sampling and convenience sampling are two different methods used in qualitative research to select participants for a study. While both methods involve non-random sampling techniques, they differ in terms of their underlying principles and the purpose for which they are employed.
Purposive sampling, also known as judgmental or selective sampling, is a technique where researchers deliberately select participants who possess specific characteristics or qualities that are relevant to the research question. The selection is based on the researcher's judgment and expertise, aiming to include individuals who can provide valuable insights or represent a particular group or perspective. This method is commonly used when the researcher seeks to gain in-depth understanding of a specific phenomenon or when the target population is limited or difficult to access. Purposive sampling allows for a focused and targeted approach, ensuring that participants have the necessary knowledge or experience to contribute meaningfully to the study.
On the other hand, convenience sampling, also referred to as availability or accidental sampling, involves selecting participants based on their easy accessibility and willingness to participate. This method relies on convenience and practicality, as participants are chosen simply because they are readily available and convenient to reach. Convenience sampling is often used when time, resources, or logistical constraints limit the researcher's ability to access a larger or more representative sample. It is commonly employed in exploratory or preliminary studies, where the primary goal is to gather initial insights or generate hypotheses. However, convenience sampling may introduce bias, as participants who are easily accessible may not be representative of the broader population or may have unique characteristics that influence the findings.
In summary, the main difference between purposive sampling and convenience sampling lies in their underlying principles and the purpose for which they are used. Purposive sampling involves the deliberate selection of participants based on specific characteristics or qualities relevant to the research question, aiming for a focused and targeted approach. Convenience sampling, on the other hand, relies on the accessibility and willingness of participants, often resulting in a sample that may not be representative of the broader population. While purposive sampling allows for a more strategic selection of participants, convenience sampling is more practical and suitable for exploratory or preliminary studies.