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# notes - Trouble all previous models assume all individuals...

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- Trouble: all previous models assume all individuals in the population have the same birth and death rate. Facts : death rate varies by age, size, and stage of development. Solution : Life table- shows the number of individuals by different age, size, or stages in a population, as well as the survivorship and mortality at each stage. Common symbols : x = time interval by age, age class, size, or stage N x , n x , or a x = the number of survival in the given time interval l x = survivorship, the proportion surviving to the time interval d x = the number of individuals dies between time x and x+1 q x = mortality rate, the proportion of individuals dies between x and x+1 e x = life expectancy for individuals reaching time x d - Types of life tables: Cohort life tables (cohort – group of individuals of the same age) Procedure: Record all individuals each year form birth until all died. Trouble

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notes - Trouble all previous models assume all individuals...

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