The Implications of Population Changes on Generalization and Study Design

Autor/inn/en	Chan, Wendy; Oh, Jimin; Luo, Peihao
Titel	The Implications of Population Changes on Generalization and Study Design
Quelle	In: Journal of Research on Educational Effectiveness, 14 (2021) 2, S.471-500 (30 Seiten)Infoseite zur Zeitschrift PDF als Volltext Verfügbarkeit
Zusatzinformation	ORCID (Chan, Wendy)
Sprache	englisch
Dokumenttyp	gedruckt; online; Zeitschriftenaufsatz
ISSN	1934-5747
DOI	10.1080/19345747.2021.1875529
Schlagwörter	Generalization; Research Design; Demography; Case Studies; Longitudinal Studies; Randomized Controlled Trials; Racial Composition; Middle School Students; Grade 7; Nontraditional Education; Generalizability Theory; Texas; Indiana + Suchen Sie Ihr Suchwort? Forschungsdesign; Demografie; Case study; Fallstudie; Case Study; Longitudinal study; Longitudinal method; Longitudinal methods; Längsschnittuntersuchung; Middle school; Middle schools; Student; Students; Mittelschule; Mittelstufenschule; Schüler; Schülerin; School year 07; 7. Schuljahr; Schuljahr 07; Non-traditional education; Alternative Erziehung
Abstract	Findings from experimental studies have increasingly been used to inform policy in school settings. Thus far, the populations in many of these studies are typically defined in a cross-sectional context; namely, the populations are defined in the same academic year in which the study took place or the population is defined at a fixed time point. This study assesses the extent to which the composition (observable characteristics) of a population changes over time and the implications of these changes for generalization and study design. We center our discussion around two case studies, both of which were cluster randomized trials in education. For each study, we collected multiple years of population level data and analyzed the types of changes that occurred in each study population over the given time period. Overall, we find that the most consistent changes are associated with the racial and demographic composition of the student populations. We discuss the implications of these changes and how they affect the types of populations for whom the findings of a study will be relevant. (As Provided).
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Erfasst von	ERIC (Education Resources Information Center), Washington, DC
Update	2024/1/01