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	Lexis Diagram	Analisi della tavola di mortalità
Campo	Demografia	Demografia
Famiglia	Process / pipeline	Survival analysis
Anno di origine	1875	1984
Ideatore	Wilhelm Lexis	Demographic/actuarial tradition; Chiang
Tipo	Geometric bookkeeping device for demographic events on the age, period, and cohort axes	Age-structured mortality estimator
Fonte seminale	Preston, S. H., Heuveline, P., & Guillot, M. (2001). Demography: Measuring and Modeling Population Processes. Blackwell. ISBN: 9781557864512	Chiang, C. L. (1984). The Life Table and Its Applications. Robert E. Krieger Publishing. ISBN: 978-0-89874-565-2
Alias	Lexis surface, Age-period-cohort diagram, Lexis grid, Lexis Diyagramı	Mortality Table, Actuarial Table, Survival Table, Yaşam Tablosu
Correlati	4	3
Sintesi	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.	A life table is a systematic, age-structured summary of the mortality experience of a population. It traces a hypothetical cohort of births — conventionally 100,000 — through successive age intervals, recording how many survive, how many die, and how many person-years are lived at each interval. The method was formalized in its modern probabilistic form by Chiang (1984), synthesizing centuries of actuarial and demographic practice into a rigorous statistical framework applicable to human and biological populations alike.