Sammenlign metoder

	Komparativ trendforskning	Longitudinal Research	Trend Research
Fagområde	Forskningsdesign	Forskningsdesign	Forskningsdesign
Familie	Process / pipeline	Process / pipeline	Process / pipeline
Oprindelsesår	1970s–1990s (formalized alongside longitudinal and trend designs)	Late 19th–early 20th century; methodologically codified through the 20th century	Mid-20th century (formalised in social science methodology ~1950s–1960s)
Ophavsperson	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	Earl Babbie and survey research tradition
Type	Quantitative non-experimental design	Quantitative (or mixed) observational research design	Quantitative longitudinal research design
Oprindelig kilde	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	Creswell, J. W. (2014). Research Design: Qualitative, Quantitative, and Mixed Methods Approaches (4th ed.). Sage. ISBN: 978-1452226101
Aliasser	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	trend study, trend survey, longitudinal trend study, time-series survey
Relaterede	3	4	4
Resumé	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.	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.