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	Badanie trendów porównawczych	Badania podłużne
Dziedzina	Projektowanie badań	Projektowanie badań
Rodzina	Process / pipeline	Process / pipeline
Rok powstania	1970s–1990s (formalized alongside longitudinal and trend designs)	Late 19th–early 20th century; methodologically codified through the 20th century
Twórca	Developed within the survey research tradition; comparative extension attributed broadly to Babbie, Creswell, and related methodologists	No single originator; foundational methodological treatments by Stuart Menard and Judith Singer & John Willett
Typ	Quantitative non-experimental design	Quantitative (or mixed) observational research design
Źródło pierwotne	Creswell, J. W. (2002). Research Design: Qualitative, Quantitative, and Mixed Methods Approaches (2nd ed.). Sage Publications. ISBN: 978-0761924425	Menard, S. (2002). Longitudinal Research (2nd ed.). Sage Publications. ISBN: 978-0761922841
Inne nazwy	comparative trend study, multi-group trend study, cross-group trend analysis, comparative longitudinal survey	longitudinal study, longitudinal design, prospective longitudinal study, repeated-measures observational study
Pokrewne	3	4
Podsumowanie	Comparative trend research is a quantitative non-experimental design that tracks changes in one or more variables over time within two or more distinct groups or populations. By drawing independent cross-sectional samples from each group at multiple time points, it reveals whether trends diverge, converge, or differ in magnitude across groups — answering not just 'is this changing?' but 'is it changing differently for different populations?'	Longitudinal research is an observational design in which the same participants, groups, or units are measured repeatedly over an extended period. Rather than capturing a single snapshot, it tracks change, stability, and temporal sequencing of variables — making it the primary non-experimental strategy for studying development, growth, decline, and the unfolding of causal processes across time.