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Multilingual Demographic Dictionary, second unified edition, English volume
Mortality surface
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A calendar-year life table 1 or period life table 1 (cf. 153-2; 432-1) is one in which the mortality rates used relate to a specified time interval and the cohort (116-2) is therefore hypothetical. A generation life table 2, or cohort life table 2 on the other hand, traces the experience of an actual birth cohort and the mortality rates contained in the table are then spread over a prolonged period, usually about 100 years. A mortality surface 3 is drawn when probabilities of dying (431-1) are plotted against age and time period simultaneously in a three-dimensional diagram. More...