Compară metode

	Cercetarea de trend – Proiectarea studiului de trend	Cercetare Longitudinală	Cercetare de panel
Domeniu	Design de cercetare	Design de cercetare	Design de cercetare
Familie	Process / pipeline	Process / pipeline	Process / pipeline
Anul apariției	Mid-20th century (formalised in social science methodology ~1950s–1960s)	Late 19th–early 20th century; methodologically codified through the 20th century	1970s-1980s (econometric formalization); earlier social survey use from 1940s
Autorul original	Earl Babbie and survey research tradition	No single originator; foundational methodological treatments by Stuart Menard and Judith Singer & John Willett	Social science and econometric traditions; systematized by Cheng Hsiao and others from the 1970s-1980s
Tip	Quantitative longitudinal research design	Quantitative (or mixed) observational research design	Quantitative longitudinal observational design
Sursa seminală	Creswell, J. W. (2014). Research Design: Qualitative, Quantitative, and Mixed Methods Approaches (4th ed.). Sage. ISBN: 978-1452226101	Menard, S. (2002). Longitudinal Research (2nd ed.). Sage Publications. ISBN: 978-0761922841	Hsiao, C. (2003). Analysis of Panel Data (2nd ed.). Cambridge University Press. ISBN: 978-0521522717
Denumiri alternative	trend study, trend survey, longitudinal trend study, time-series survey	longitudinal study, longitudinal design, prospective longitudinal study, repeated-measures observational study	panel study, panel survey, longitudinal panel, repeated-measures panel
Înrudite	4	4	3
Rezumat	Trend research is a longitudinal quantitative design that tracks changes in a characteristic of a general population over time by surveying different, independently drawn samples at two or more time points. Unlike panel studies, the same individuals are not followed; rather, each wave draws a fresh sample from the same population, allowing researchers to detect population-level shifts in attitudes, behaviours, or conditions while avoiding the attrition and panel conditioning problems of repeated-measures designs.	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.	Panel research is a quantitative longitudinal design in which the same individuals, organizations, or other units are measured repeatedly across two or more time points. Unlike cross-sectional surveys that capture a single snapshot, a panel tracks change within units, enabling researchers to separate genuine within-unit change from between-unit differences and to model causal dynamics over time.