Lecture 4 - Rates and Composition

Lecture 4 - Rates and Composition - Rates and Population...

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September 10, 2008 Rates and Population Composition
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Rates: Making comparisons over time, place, or groups Crude rates Basic measures Data – vital registration (numerator) and census (denominator) Specific rates – e.g., age-specific rates Adjusted or Standardized Rates Growth Rates
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Crude Rates Crude rate = (E/P)*k Where, D is the # of events over some accounting period (usually a year); P is the “population at risk” (mid-year); and k is a constant (100, 1000, etc.)
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Examples Crude birth rate Crime rate Poverty rate Cancer death rate
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Crude Birth Rates, U.S., 1980-2003 0.0 5.0 10.0 15.0 20.0 25.0 1980 ...................... 1981 ...................... 1982 ...................... 1983 ...................... 1984 ...................... 1985 ...................... 1986 ...................... 1987 ...................... 1988 ...................... 1989 ...................... 1990 ...................... 1991 ..................... 1992 ..................... 1993 ..................... 1994 ..................... 1995 ..................... 1996 ..................... 1997 ..................... 1998 ..................... 1999 ..................... 2000 ..................... 2001 ..................... 2002 ..................... 2003 ..................... Year Rate Crude Birth Rate
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Denominator: Census
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Numerator: Vital registration
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Other rates
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Violent Crime Index base upon 100,000 People, Ithaca Year Population Murd Rape Robbery Assault Total Violent Crime 2005 29,995 0.0 13.3 100.0 146.7 260.0 2004 30,401 0.0 0.0 0.0 0.0 0.0 2003 30,025 0.0 0.0 20.0 13.3 33.3 2002 29,567 0.0 13.5 98.1 44.0 155.6 2001 29,341 3.4 20.4 68.2 47.7 139.7 2000 29,287 6.8 3.4 92.2 34.1 136.6 1995 29,188 0.0 17.1 164.5 58.2 239.8 1990 29,541 0.0 13.5 57.5 179.4 250.5 1985 28,611 3.5 28.0 45.4 209.7 286.6 1980 28,846 0.0 10.4 27.7 31.2 69.3
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Poverty rates
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What is “crude” of these rates?
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General and Specific Rates
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General Fertility Rate
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Specific rates (including general rates) Rates that are disaggregated by some demographic characteristic (age, race/ethnicity, nativity, etc.)
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