So sánh phương pháp

	Khảo sát dọc	Phương pháp Nhật ký
Lĩnh vực	Phương pháp luận khảo sát	Phương pháp luận khảo sát
Họ	Process / pipeline	Process / pipeline
Năm ra đời	1940s (panel survey tradition); longitudinal designs codified mid-20th century	1920s–1940s (systematised by Allport, 1942)
Người khởi xướng	Established tradition; formalized in social science by Paul Lazarsfeld and colleagues (1940s panel studies)	Gordon Allport (systematic social-science use); Nels Anderson (early fieldwork diaries)
Loại	Quantitative / mixed-methods survey design	Qualitative / mixed-methods data-collection technique
Công trình gốc	Menard, S. (2002). Longitudinal Research (2nd ed.). Sage Publications. ISBN: 978-0761922292	Alaszewski, A. (2006). Using Diaries for Social Research. Sage. ISBN: 978-0761941415
Tên gọi khác	panel survey, repeated-measures survey, longitudinal panel study, wave survey	diary study, diary technique, self-report diary, daily diary method
Liên quan	3	5
Tóm tắt	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.	The diary method is a data-collection technique in which participants record their thoughts, behaviours, events, or experiences in their own words at regular or event-contingent intervals over a defined study period. By capturing data close in time to the event, diaries reduce retrospective recall bias and give researchers access to the texture of everyday life as it unfolds — something one-off surveys and retrospective interviews cannot provide.