Σύγκριση μεθόδων

	Έρευνα με διαχρονικές (διαμήκεις) δημοσκοπήσεις	Έρευνα με Δείγμα
Πεδίο	Ερευνητικός Σχεδιασμός	Ερευνητικός Σχεδιασμός
Οικογένεια	Process / pipeline	Process / pipeline
Έτος προέλευσης	Mid-20th century (formalized ~1950s–1970s)	Late 19th century; methodologically systematised 1940s–1960s
Δημιουργός	Survey methodology tradition; codified in social sciences by scholars including W.S. Robinson (1950) and later Scott Menard	Francis Galton, Charles Booth, and early social statisticians; systematised by Paul Lazarsfeld and colleagues at Columbia in the 1940s
Τύπος	Quantitative observational research design	Quantitative (and mixed) non-experimental design
Θεμελιώδης πηγή	Menard, S. (2002). Longitudinal Research (2nd ed.). Sage Publications. ISBN: 978-0761922452	Fowler, F. J. (2014). Survey Research Methods (5th ed.). Sage Publications. ISBN: 978-1452259000
Εναλλακτικές ονομασίες	longitudinal survey study, repeated-measures survey, prospective survey design, panel survey	survey methodology, questionnaire research, survey design, survey study
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.	Survey research is a quantitative (and sometimes mixed-methods) design in which a researcher collects standardised self-report data from a sample drawn from a defined population, using a questionnaire or structured interview. It is the dominant non-experimental strategy for describing population characteristics, estimating prevalence, mapping attitude distributions, and testing bivariate or multivariate associations across social, behavioural, and health sciences.