So sánh phương pháp

	Khảo sát trực tuyến	Khảo sát dọc
Lĩnh vực	Phương pháp luận khảo sát	Phương pháp luận khảo sát
Họ	Process / pipeline	Process / pipeline
Năm ra đời	Mid-1990s (widespread scholarly adoption ~1995–2000)	1940s (panel survey tradition); longitudinal designs codified mid-20th century
Người khởi xướng	Mick P. Couper, Don A. Dillman (early systematic frameworks)	Established tradition; formalized in social science by Paul Lazarsfeld and colleagues (1940s panel studies)
Loại	Quantitative / mixed-methods data collection technique	Quantitative / mixed-methods survey design
Công trình gốc	Couper, M. P. (2000). Web surveys: A review of issues and approaches. Public Opinion Quarterly, 64(4), 464–494.	Menard, S. (2002). Longitudinal Research (2nd ed.). Sage Publications. ISBN: 978-0761922292
Tên gọi khác	web survey, internet survey, e-survey, computer-assisted web interviewing	panel survey, repeated-measures survey, longitudinal panel study, wave survey
Liên quan	6	3
Tóm tắt	An online survey is a structured data collection instrument hosted on a web platform and completed by respondents via internet-connected devices. It enables large-scale, geographically dispersed data gathering at low cost and with rapid turnaround. Respondents self-administer the questionnaire at their convenience, which reduces interviewer bias and permits automatic data capture. Online surveys are the dominant mode of survey research in social, behavioural, health, and market research today.	A longitudinal survey collects structured questionnaire data from the same individuals or units at two or more distinct points in time. By tracking the same respondents across waves, researchers can distinguish genuine change from stable individual differences, establish temporal ordering between variables, and model trajectories of attitudes, behaviors, or outcomes in ways that a single cross-sectional snapshot cannot support.