Σύγκριση μεθόδων

	Έρευνα με διαχρονικές (διαμήκεις) δημοσκοπήσεις	Έρευνα Τάσεων
Πεδίο	Ερευνητικός Σχεδιασμός	Ερευνητικός Σχεδιασμός
Οικογένεια	Process / pipeline	Process / pipeline
Έτος προέλευσης	Mid-20th century (formalized ~1950s–1970s)	Mid-20th century (formalised in social science methodology ~1950s–1960s)
Δημιουργός	Survey methodology tradition; codified in social sciences by scholars including W.S. Robinson (1950) and later Scott Menard	Earl Babbie and survey research tradition
Τύπος	Quantitative observational research design	Quantitative longitudinal research design
Θεμελιώδης πηγή	Menard, S. (2002). Longitudinal Research (2nd ed.). Sage Publications. ISBN: 978-0761922452	Creswell, J. W. (2014). Research Design: Qualitative, Quantitative, and Mixed Methods Approaches (4th ed.). Sage. ISBN: 978-1452226101
Εναλλακτικές ονομασίες	longitudinal survey study, repeated-measures survey, prospective survey design, panel survey	trend study, trend survey, longitudinal trend study, time-series survey
Συναφείς	5	4
Σύνοψη	Longitudinal survey research collects structured questionnaire data from the same individuals (or units) at two or more points in time. Unlike a one-shot cross-sectional survey, this design captures change, stability, and temporal ordering of variables — enabling researchers to track trajectories, test causal sequences, and distinguish cohort effects from aging effects within a quantitative framework.	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.