Σύγκριση μεθόδων

	Ερευνητική Περιγραφή	Έρευνα πάνελ	Έρευνα Τάσεων
Πεδίο	Ερευνητικός Σχεδιασμός	Ερευνητικός Σχεδιασμός	Ερευνητικός Σχεδιασμός
Οικογένεια	Process / pipeline	Process / pipeline	Process / pipeline
Έτος προέλευσης	Late 19th century; formalized in social/behavioral sciences ~1960s–1980s	1970s-1980s (econometric formalization); earlier social survey use from 1940s	Mid-20th century (formalised in social science methodology ~1950s–1960s)
Δημιουργός	Francis Galton, Karl Pearson (early empirical tradition); formalized in social science by Fred Kerlinger	Social science and econometric traditions; systematized by Cheng Hsiao and others from the 1970s-1980s	Earl Babbie and survey research tradition
Τύπος	Non-experimental quantitative research design	Quantitative longitudinal observational design	Quantitative longitudinal research design
Θεμελιώδης πηγή	Creswell, J. W. (2014). Research Design: Qualitative, Quantitative, and Mixed Methods Approaches (4th ed.). Sage. ISBN: 978-1452226101	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
Εναλλακτικές ονομασίες	descriptive study, descriptive survey design, observational descriptive research, non-experimental descriptive research	panel study, panel survey, longitudinal panel, repeated-measures panel	trend study, trend survey, longitudinal trend study, time-series survey
Συναφείς	3	3	4
Σύνοψη	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.	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.