Vertaile menetelmiä

	Trenditutkimus	Kuvaileva tutkimus	Pitkittäistutkimus
Tieteenala	Tutkimusasetelma	Tutkimusasetelma	Tutkimusasetelma
Menetelmäperhe	Process / pipeline	Process / pipeline	Process / pipeline
Syntyvuosi	Mid-20th century (formalised in social science methodology ~1950s–1960s)	Late 19th century; formalized in social/behavioral sciences ~1960s–1980s	Late 19th–early 20th century; methodologically codified through the 20th century
Kehittäjä	Earl Babbie and survey research tradition	Francis Galton, Karl Pearson (early empirical tradition); formalized in social science by Fred Kerlinger	No single originator; foundational methodological treatments by Stuart Menard and Judith Singer & John Willett
Tyyppi	Quantitative longitudinal research design	Non-experimental quantitative research design	Quantitative (or mixed) observational research design
Alkuperäislähde	Creswell, J. W. (2014). Research Design: Qualitative, Quantitative, and Mixed Methods Approaches (4th ed.). Sage. ISBN: 978-1452226101	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
Rinnakkaisnimet	trend study, trend survey, longitudinal trend study, time-series survey	descriptive study, descriptive survey design, observational descriptive research, non-experimental descriptive research	longitudinal study, longitudinal design, prospective longitudinal study, repeated-measures observational study
Liittyvät	4	3	4
Tiivistelmä	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.	Descriptive research is a non-experimental quantitative design that systematically documents the characteristics, frequencies, or distributions of variables in a defined population at a given point in time. It answers 'what is' questions — who, what, when, where, and how much — without manipulating variables or drawing causal conclusions. It is one of the most widely used research designs across the social, behavioral, health, and education sciences.	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.