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Age-Specific Rates & Probabilities

This document analyzes age-specific death rates (ASDRs) and their relationship with the crude death rate (CDR), emphasizing the importance of standardization in demographic studies. It explains the procedure of standardizing rates to eliminate population structure effects, detailing options for choosing a standard population and decomposing differences in rates. The text also covers infant mortality rates and mortality crossovers, providing a deeper understanding of demographic events over time and the factors influencing mortality rates across different age groups.

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Age-Specific Rates & Probabilities

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  1. Age-Specific Rates & Probabilities September 10, 2008

  2. Period Age-Specific Death Rates nMx[0,T] Number of deaths in the age range x to x+n between time 0 and T ______________________________________________________ Number of person-years lived in the age range x to x+n between time 0 and T

  3. Relationship between CDR and ASDRs • The CDR reflects the sum of all weighted ASDRs (weighted by the proportion of the population in each age group)

  4. Standardization • Eliminating/minimizing the effects of population structure when comparing rates • PROCEDURE: Multiplying each subgroup-specific rate by the proportion of the “standard” population in that subgroup

  5. Options for Standardization • Pick one population for standard • Average for 2 or more populations • Pick another population

  6. Decomposition • Determining the proportion of a difference in rates that comes from differences in population structure and the proportion that comes from a difference in rate schedules • Box 2.2 on p.30

  7. Lexus Diagrams • Graphic representation of demographic events in time and persons at risk

  8. Age Specific Probabilities nqx

  9. Infant Mortality Rate Infant deaths in a year Births in a year

  10. Mortality Crossovers(Coale & Kisker 1986) • What is a mortality crossover? • What are the two explanations for mortality crossovers?

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