I. Definitions:

- Demography: The study of population
- Population Geography: Spatial aspects of demography or population, answers questions of where? And why there?
- Spatial Epidemiology and Medical Geography: studies the origin and diffusion of disease.
- At-Risk Principle

II. Demographic Accounting Equation

- P(t+1)=P(t)

+B(t, t+1)-D(t, t-1) natural change

+I(t, t+1)-E(t, t-1) net migration - Internal Migration vs. International Migration

Internal: Between states within a country

International: Between countries - Composition of Migration: Who is migrating where?

--example: California, most immigrants come to L.A.

III. Constructing and Interpreting Rates

- Demographic Rates and Measures
- Rate: the frequency of occurrence of a demographic event for a population at risk over a given time period.
- Crude Birth Rate (CBR): annual number of live births per 1,000 population
- Crude Death Rate (CDR): annual number of deaths per 1,000 population
- Total Fertility Rate (TFR): average number of children
born to each woman if during her childbearing years she bore

children at current years rate fro women her age. - Expectancy of Life at Birth (or age X)(e0): the amount of years you are expected to live (differs between countries).
- Doubling Time: Amount of time it takes for a country to completely double its population (ln(2)/r)

- Examples:

CBR > CDR natural population
increase

CBR < CDR natural population
decrease

Example: Syria
(CBR=33, CDR=6)

Natural increase: 33-6=27 per 1,000 or 2.7%

Doubling Time: ln(2)/.027=25.7 years

Example: Afghanistan
(CBR=42, CDR=17)

Natural Increase: 42-17=25 per 1,000 or 2.5%

Doubling Time: ln(2)/.025=27.7 years

Example: Japan
(CBR=10, CDR=8)

Natural Increase: 10-8=2 per 1,000 or .2%

Doubling Time: ln(2)/.002=347 years