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	Lexis Diagram	ली-कार्टर मॉडल
क्षेत्र	जनसांख्यिकी	जनसांख्यिकी
परिवार	Process / pipeline	Regression model
उद्भव वर्ष	1875	1992
प्रवर्तक	Wilhelm Lexis	Ronald Lee & Lawrence Carter
प्रकार	Geometric bookkeeping device for demographic events on the age, period, and cohort axes	Stochastic mortality forecasting model
मौलिक स्रोत	Preston, S. H., Heuveline, P., & Guillot, M. (2001). Demography: Measuring and Modeling Population Processes. Blackwell. ISBN: 9781557864512	Lee, R. D., & Carter, L. R. (1992). Modeling and forecasting U.S. mortality. Journal of the American Statistical Association, 87(419), 659–671.
उपनाम	Lexis surface, Age-period-cohort diagram, Lexis grid, Lexis Diyagramı	LC Model, Lee-Carter Mortality Model, Singular Value Decomposition Mortality Model, Lee-Carter Ölümlülük Modeli
संबंधित	4	2
सारांश	The Lexis diagram is a geometric bookkeeping device that places every demographic event in a two-dimensional grid of age against calendar time, so that each person's life traces a diagonal line and each cohort fans out as a band of parallel lifelines. Named after the German statistician Wilhelm Lexis, it is the foundational drawing of formal demography: it makes the otherwise confusing relationship between age, period, and birth cohort visible, and it tells the analyst exactly which deaths, births, and person-years belong together when a rate is computed.	The Lee-Carter model is a stochastic framework for modeling and forecasting age-specific mortality rates, introduced by Ronald Lee and Lawrence Carter in their landmark 1992 paper. It decomposes the logarithm of age-specific death rates into an age pattern of mortality, a time-varying index of mortality level, and an age-specific sensitivity of that index, then forecasts the time index using ARIMA time-series methods to generate probabilistic mortality projections.