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#survival analysis

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

If survival drops to zero at age 2, the organism is:

“Annual or semelparous” for if survival drops to zero at age 2, the organism is. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. Survivorship curves summarize age-specific mortality: Type I concentrates loss late in life, Type II approximates a constant hazard, and Type III concentrates loss early. They are empirical patterns, not rigid taxonomic rules. The remaining alternatives—“Iteroparous”, “Long-lived”, “Mammalian”—refer to different states, processes, or scales and therefore do not express t

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

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