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#demographic methods

2 public questions tagged with this topic.

Life Table Age Pyramid

Which of the following represents a cohort life table?

“Data from individuals followed from birth to death” for which of the following represents a cohort life table. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. Life-history traits reflect allocation among growth, maintenance, survival, and reproduction. Energy invested in many offspring cannot simultaneously be invested in large offspring, prolonged care, or future breeding, creating measurable trade-offs. The remaining alternatives—“Cross-sectional data”, “Long-term ecological survey”, “Age-speci

Ref: Ecology: Concepts and Applications, Molles, 9th Ed., Ch. 10

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Life Table Age Pyramid

qx is calculated by:

“dx/nx” for qx is calculated by. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. Life-history traits reflect allocation among growth, maintenance, survival, and reproduction. Energy invested in many offspring cannot simultaneously be invested in large offspring, prolonged care, or future breeding, creating measurable trade-offs. The remaining alternatives—“lx/nx”, “mx/lx”, “nx/dx”—refer to different states, processes, or scales and therefore do not express the same causal relationship. Survivorshi

Ref: Ecology: Concepts and Applications, Molles, 9th Ed., Ch. 10

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