手法を比較

	比較トレンド研究	トレンド調査
分野	研究デザイン	研究デザイン
系統	Process / pipeline	Process / pipeline
提唱年	1970s–1990s (formalized alongside longitudinal and trend designs)	Mid-20th century (formalised in social science methodology ~1950s–1960s)
提唱者	Developed within the survey research tradition; comparative extension attributed broadly to Babbie, Creswell, and related methodologists	Earl Babbie and survey research tradition
種類	Quantitative non-experimental design	Quantitative longitudinal research design
原典	Creswell, J. W. (2002). Research Design: Qualitative, Quantitative, and Mixed Methods Approaches (2nd ed.). Sage Publications. ISBN: 978-0761924425	Creswell, J. W. (2014). Research Design: Qualitative, Quantitative, and Mixed Methods Approaches (4th ed.). Sage. ISBN: 978-1452226101
別名	comparative trend study, multi-group trend study, cross-group trend analysis, comparative longitudinal survey	trend study, trend survey, longitudinal trend study, time-series survey
関連	3	4
概要	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?'	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.