Glossary

Great-circle distance
The shortest distance between two points along the surface of a sphere or ellipsoid. Applies/refers to the shortest distance between two cities or towns (using the city/municipal center coordinates as points).
Age dependency ratio
The ratio of persons in "dependent" ages (generally under age 15 and over age 64) to those in "economically productive" ages (15 to 64 years) in the population. It is dometimes divided into the old-age dependency (the ratio of people aged 65 and older to those aged 15 to 64 years), and the child dependency (ratio of people under 15 to those aged 15 to 64 years). Source: PSA
Median age
The age that divides a population into two numerically equal groups, that is, half of the population are younger than this age, and the other half are older. Source: PSA
Population growth rate
The rate at which the population increases within a given time or period. Applies/refers to the calculated growth rates between each census.
Primary Road
National Road classification, a road that connects major cities with population of at least 100,000. Source: DPWH
Secondary Road
National Road classification, a road which complements the national primary roads to provide access to main population and production centers of the country. Source: DPWH
Tertiary Road
National Road classification, an existing road under the DPWH which performs a local function. Source: DPWH
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