قارن الطرق

	بحث الاتجاهات القائم على العينة	دراسة الأتراب
المجال	تصميم البحث	علم الأوبئة
العائلة	Process / pipeline	Process / pipeline
سنة النشأة	1940s–1960s	Mid-20th century (formal epidemiological design codified ~1950s)
صاحب الطريقة	Established through survey methodology and panel econometrics; foundational contributions by Paul Lazarsfeld (1940s) and later systematized by econometricians including Zvi Griliches and Yair Mundlak	Doll & Hill (British Doctors Study, 1951); Snow (cholera, 1854)
النوع	Quantitative longitudinal observational design	Observational longitudinal study design
المصدر التأسيسي	Menard, S. (2002). Longitudinal Research (2nd ed.). Sage Publications. ISBN: 978-0761922452	Rothman, K. J., Greenland, S., & Lash, T. L. (2008). Modern Epidemiology (3rd ed.). Lippincott Williams & Wilkins. ISBN: 978-0781755641
الأسماء البديلة	panel trend study, longitudinal panel design, repeated-measures panel survey, panel survey trend analysis	longitudinal study, follow-up study, panel study, incidence study
ذات صلة	3	6
الملخص	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 cohort study assembles a group of individuals who share a common starting point — typically freedom from the outcome of interest — and follows them over time to observe who develops the outcome. By comparing incidence rates between exposed and unexposed subgroups, researchers can estimate relative risk and absolute risk differences. Cohort studies are the gold-standard observational design for measuring disease incidence and establishing temporal relationships between exposure and outcome.