مقایسهٔ روش‌ها

	پژوهش روند مقایسه‌ای	پژوهش پانل	پژوهش روند
حوزه	طراحی پژوهش	طراحی پژوهش	طراحی پژوهش
خانواده	Process / pipeline	Process / pipeline	Process / pipeline
سال پیدایش	1970s–1990s (formalized alongside longitudinal and trend designs)	1970s-1980s (econometric formalization); earlier social survey use from 1940s	Mid-20th century (formalised in social science methodology ~1950s–1960s)
پدیدآور	Developed within the survey research tradition; comparative extension attributed broadly to Babbie, Creswell, and related methodologists	Social science and econometric traditions; systematized by Cheng Hsiao and others from the 1970s-1980s	Earl Babbie and survey research tradition
نوع	Quantitative non-experimental design	Quantitative longitudinal observational design	Quantitative longitudinal research design
منبع بنیادین	Creswell, J. W. (2002). Research Design: Qualitative, Quantitative, and Mixed Methods Approaches (2nd ed.). Sage Publications. ISBN: 978-0761924425	Hsiao, C. (2003). Analysis of Panel Data (2nd ed.). Cambridge University Press. ISBN: 978-0521522717	Creswell, J. W. (2014). Research Design: Qualitative, Quantitative, and Mixed Methods Approaches (4th ed.). Sage. ISBN: 978-1452226101
نام‌های دیگر	comparative trend study, multi-group trend study, cross-group trend analysis, comparative longitudinal survey	panel study, panel survey, longitudinal panel, repeated-measures panel	trend study, trend survey, longitudinal trend study, time-series survey
مرتبط	3	3	4
خلاصه	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?'	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.	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.