Σύγκριση μεθόδων

	Έρευνα με διαχρονικές (διαμήκεις) δημοσκοπήσεις	Έρευνα με Διασχολικές Έρευνες
Πεδίο	Ερευνητικός Σχεδιασμός	Ερευνητικός Σχεδιασμός
Οικογένεια	Process / pipeline	Process / pipeline
Έτος προέλευσης	Mid-20th century (formalized ~1950s–1970s)	1930s–1950s (formalized with large-scale opinion and health surveys)
Δημιουργός	Survey methodology tradition; codified in social sciences by scholars including W.S. Robinson (1950) and later Scott Menard	Established through the social survey tradition (Bowley, Gallup, and others in the early-to-mid 20th century)
Τύπος	Quantitative observational research design	Quantitative non-experimental design
Θεμελιώδης πηγή	Menard, S. (2002). Longitudinal Research (2nd ed.). Sage Publications. ISBN: 978-0761922452	Fowler, F. J. (2009). Survey Research Methods (4th ed.). Sage Publications. ISBN: 978-1412958929
Εναλλακτικές ονομασίες	longitudinal survey study, repeated-measures survey, prospective survey design, panel survey	cross-sectional survey, single-occasion survey, prevalence survey design, snapshot 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.	Cross-sectional survey research administers a structured questionnaire or interview to a representative sample of a population at one point in time. It is the workhorse design for estimating prevalence, describing group characteristics, and mapping associations among variables across a wide range of disciplines — from public health and education to marketing and political science.