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	Ekologisk studie	Multilevel Modeling
Ämnesområde	Epidemiologi	Forskningsstatistik
Familj	Process / pipeline	Process / pipeline
Ursprungsår	19th century (Snow 1854); formalised mid-20th century	1992
Upphovsperson	Various; foundational work by John Snow (1854) and systematised in modern form by Brian MacMahon and colleagues	Anthony Bryk and Stephen Raudenbush
Typ	Observational epidemiological study	Method
Ursprungskälla	Morgenstern, H. (1995). Ecologic studies in epidemiology: concepts, principles, and methods. Annual Review of Public Health, 16(1), 61–81.	Bryk, A. S., & Raudenbush, S. W. (1992). Hierarchical Linear Models: Applications and Data Analysis Methods. SAGE Publications.
Alias	aggregate study, correlational study, ecological correlation study, population-level study	HLM, mixed-effects models, random effects models, MLM
Närliggande	5	3
Sammanfattning	An ecological study is an observational epidemiological design in which the unit of analysis is a group or population — a country, region, city, or time period — rather than an individual. Exposures and outcomes are measured as aggregates (rates, proportions, or means) and then correlated across groups to generate or evaluate hypotheses about population-level associations between risk factors and disease.	Multilevel modeling (also called hierarchical linear modeling, mixed-effects modeling) is a statistical framework for analyzing data organized in nested or clustered structures—students within schools, patients within hospitals, repeated measures within individuals. Developed by Bryk and Raudenbush (1992), it accounts for dependency among observations and partitions variance into levels (within-cluster and between-cluster), enabling valid inference and revealing context effects. Essential in education, medicine, organizational research, and any field where data have natural hierarchies.