How Many Focus Groups Are Enough? Building an Evidence Base for Nonprobability Sample Sizes

Autor/inn/en	Guest, Greg; Namey, Emily; McKenna, Kevin
Titel	How Many Focus Groups Are Enough? Building an Evidence Base for Nonprobability Sample Sizes
Quelle	In: Field Methods, 29 (2017) 1, S.3-22 (20 Seiten) PDF als Volltext Verfügbarkeit
Sprache	englisch
Dokumenttyp	gedruckt; online; Zeitschriftenaufsatz
ISSN	1525-822X
DOI	10.1177/1525822X16639015
Schlagwörter	Focus Groups; Sample Size; Evidence Based Practice; Thematic Approach; Help Seeking; Health Behavior; African Americans; Males; Probability; Sampling; Participant Characteristics; Coding; Data Analysis; Research Methodology; Research Design; North Carolina + Suchen Sie Ihr Suchwort? Themenzentrierter Unterricht; Help-seeking behavior; Help-seeking behaviour; Hilfe suchendes Verhalten; Health behaviour; Gesundheitsverhalten; Afroamerikaner; Male; Männliches Geschlecht; Wahrscheinlichkeitsrechnung; Wahrscheinlichkeitstheorie; Codierung; Programmierung; Auswertung; Research method; Forschungsmethode; Forschungsdesign
Abstract	Few empirical studies exist to guide researchers in determining the number of focus groups necessary for a research study. The analyses described here provide foundational evidence to help researchers in this regard. We conducted a thematic analysis of 40 focus groups on health-seeking behaviors of African American men in Durham, North Carolina. Our analyses revealed that more than 80% of all themes were discoverable within two to three focus groups, and 90% were discoverable within three to six focus groups. Three focus groups were also enough to identify all of the most prevalent themes within the data set. These empirically based findings suggest focus group sample sizes that differ from many of the "rule of thumb" recommendations in the existing literature. We discuss the relative generalizability of our findings to other study contexts, and we highlight some methodological questions about adequate sample sizes for focus group research. (As Provided).
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Erfasst von	ERIC (Education Resources Information Center), Washington, DC
Update	2020/1/01