विधियों की तुलना करें

	मिलान पारिस्थितिक अध्ययन	पारिस्थितिक अध्ययन
क्षेत्र	महामारी विज्ञान	महामारी विज्ञान
परिवार	Process / pipeline	Process / pipeline
उद्भव वर्ष	1970s–1990s (methodological consolidation)	19th century (Snow 1854); formalised mid-20th century
प्रवर्तक	Extension of classical ecological study design; matching principles formalized in 20th-century epidemiology	Various; foundational work by John Snow (1854) and systematised in modern form by Brian MacMahon and colleagues
प्रकार	Observational study design	Observational epidemiological study
मौलिक स्रोत	Morgenstern, H. (1998). Ecologic studies in epidemiology: Concepts, principles, and methods. Annual Review of Public Health, 16, 61–81.	Morgenstern, H. (1995). Ecologic studies in epidemiology: concepts, principles, and methods. Annual Review of Public Health, 16(1), 61–81.
उपनाम	matched ecologic study, geographically matched ecological study, area-matched ecological design, matched aggregate study	aggregate study, correlational study, ecological correlation study, population-level study
संबंधित	6	5
सारांश	A matched ecological study is an observational epidemiological design in which aggregate units — such as geographic areas, communities, or time periods — are systematically paired or matched on key characteristics before comparing exposure and outcome rates. Matching at the group level controls for area-level confounders and improves comparability between exposed and unexposed units, producing more credible estimates of ecological associations than an unmatched counterpart.	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.