Journal of Population Sciences
Variants of APC | ||
AP(C) C = P − A | The AP(C) temporal plane constitutes the classical Lexis diagram. |
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AC(P) P = C + A | The AC(P) temporal plane is equivalent to the Lexis diagram except birth cohort is given and period is derived rather than the other way around. |
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CP(A) A = P − C | The CP(A) temporal plane is equivalent to the Lexis diagram except birth cohorts are given and age is derived rather than the other way around. |
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Variants of TPD | ||
TP(D) D = P + T | Helen had 30 years of life left (T) in 1971 (P) and therefore belonged to the 2001 death cohort (D) |
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PD(T) T = D − P | Mindel died in 1973 (D). In 1953 (P) she had 20 years left to live (T). |
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TD(P) P = D − T | Irene died in 1974 (D). When she had 30 remaining years of life (T) the year must have been 1944 (P). |
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Variants of TAL | ||
TA(L) L = T + A | The time already lived and the time still left sum up to the total lifespan. |
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TL(A) A = L − T | Helen lived to the age of 86 (L). When she had 20 years left (T) she must have been 66 (A). |
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AL(T) T = A − L | Tim is 34 years old (A) and will live to the age of 96 (L), leaving him 62 years (T) to settle affairs. |
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Variants of LCD | ||
LC(D) D = C + L | Àngels was born in 1940 (C) and she lived to be 64 (L), implying an untimely death in 2004 (D) |
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CD(L) L = D − C | Pascal was born in 1893 (C) and died in 1964 (D), implying a lifespan of 71 (L), or so. |
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LD(C) C = D − L | Margaret died in Dec., 1995 (D) with a completed lifespan of 96 (L), putting her birth year in 1900 (C). |
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The uninformative dyads | ||
LP(-) | The LP plane is non-informative. No additional measures can be derived knowing just lifespan and period. |
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CT(-) | The CT plane is non-informative. No additional measures can be derived knowing just birth cohort and thanatological age. |
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AD(-) | The AD plane is non-informative. No additional measures can be derived knowing just death cohort and age. |
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