เปรียบเทียบวิธี

	การวิจัยแนวโน้มแบบกลุ่มตัวอย่างต่อเนื่อง	การสำรวจแบบระยะยาว
สาขาวิชา	การออกแบบการวิจัย	ระเบียบวิธีสำรวจ
ตระกูล	Process / pipeline	Process / pipeline
ปีกำเนิด	1940s–1960s	1940s (panel survey tradition); longitudinal designs codified mid-20th century
ผู้ริเริ่ม	Established through survey methodology and panel econometrics; foundational contributions by Paul Lazarsfeld (1940s) and later systematized by econometricians including Zvi Griliches and Yair Mundlak	Established tradition; formalized in social science by Paul Lazarsfeld and colleagues (1940s panel studies)
ประเภท	Quantitative longitudinal observational design	Quantitative / mixed-methods survey design
แหล่งต้นตำรับ	Menard, S. (2002). Longitudinal Research (2nd ed.). Sage Publications. ISBN: 978-0761922452	Menard, S. (2002). Longitudinal Research (2nd ed.). Sage Publications. ISBN: 978-0761922292
ชื่อเรียกอื่น	panel trend study, longitudinal panel design, repeated-measures panel survey, panel survey trend analysis	panel survey, repeated-measures survey, longitudinal panel study, wave survey
ที่เกี่ยวข้อง	3	3
สรุป	Panel-based trend research tracks the same group of respondents — the panel — across multiple measurement waves over time, enabling researchers to separate genuine individual-level change from cohort differences and to model how variables evolve within persons. Unlike repeated cross-sectional designs, which sample new participants at each wave, a panel design retains the same units, giving it the power to detect within-person trajectories and causal ordering among variables.	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.