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Sampling Size: Qualitative Research
The aim of qualitative research is to ensure that the population in question is studied with sufficient rigor and above all sufficient depth to yield meaningful results. "There is a point of diminishing return to a qualitative sample -- as the study goes on more data does not necessarily lead to more information… qualitative research is concerned with meaning and not making generalised hypothesis statements" (Mason 2010:8). The advantage to large sampling sizes is that they are more representative as a whole and are less likely to be thrown off by anomalies: "for qualitative studies, where the goal is to 'reduce the chances of discovery failure,' a large sample size broadens the range of possible data and forms a better picture for analysis" ("The importance of a quality sample size," 2013, Unite for Sight). In the process of qualitative research, when a small sampling size is selected even though "these informants are purposefully selected and the data themselves seem valid, there is no guarantee that these informants' views are typical" (Maxwell 2005: 91). However,...
This makes using very large numbers logistically unfeasible, given that the amount of quality time which can be spent with individual patients will inevitably be diluted (Maxwell 2005: 91-92)
Quantitative research is numerical and data-driven, and thus there are specific, statistical standards which must be met in terms of determining sample size. In contrast, determining an appropriate sample for qualitative research is primarily dependent upon finding a 'saturation point' for the data (Mason 2010:8). In other words, how many people do you need to collect data upon until no additional meaningful information will be yielded? To avoid diluting the quality of the in-depth, concentrated research, understanding the saturation point is critical. "Saturation determines the majority of qualitative sample size" (Mason 2010:8). However, saturation is very difficult to establish and can be somewhat subjective. "Researchers often claim to have achieved…
References
Mason, M. (2010). Sample size and saturation in PHD studies using qualitative research.
Qualitative Social Research, 11 (3): 8. Retrieved from http://www.qualitative-research.net/index.php/fqs/article/view/1428/3027
Maxwell, J.A. (2005). Qualitative research design: An interactive approach (2nd Ed.).
Thousand Oaks, CA: Sage.
http://www.uniteforsight.org/global-health-university/importance-of-quality-sample-size
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