Vertaile menetelmiä

	Kohorttitutkimus	Selviytymisanalyysi
Tieteenala	Epidemiologia	Tutkimuksen tilastomenetelmät
Menetelmäperhe	Process / pipeline	Process / pipeline
Syntyvuosi	Mid-20th century (formal epidemiological design codified ~1950s)	1958
Kehittäjä	Doll & Hill (British Doctors Study, 1951); Snow (cholera, 1854)	Edward L. Kaplan and Paul Meier
Tyyppi	Observational longitudinal study design	Method
Alkuperäislähde	Rothman, K. J., Greenland, S., & Lash, T. L. (2008). Modern Epidemiology (3rd ed.). Lippincott Williams & Wilkins. ISBN: 978-0781755641	Kaplan, E. L., & Meier, P. (1958). Nonparametric estimation from incomplete observations. Journal of the American Statistical Association, 53(282), 457–481.
Rinnakkaisnimet	longitudinal study, follow-up study, panel study, incidence study	Kaplan-Meier analysis, Cox regression, TTE analysis
Liittyvät	6	3
Tiivistelmä	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.	Survival analysis is a collection of statistical methods for modeling time from a defined starting point until an event of interest occurs (disease, recovery, death, equipment failure). Kaplan and Meier's nonparametric estimator (1958) and David Cox's proportional hazards model (1972) jointly enabled analysis of censored data—individuals whose event times are unknown because they left the study or were still event-free at follow-up. Indispensable in oncology, cardiology, infectious disease research, engineering reliability, and any field where time-to-event matters.