Rate of natural increase

Rate of natural increase

In demographics, the rate of natural increase (RNI) is the crude birth rate minus the crude death rate of a population. If we neglect the migration, then a positive RNI number means that the population increases and a negative number means that the population decreases.

When looking at countries, it gives an idea of what position in the Demographic Transition Model, but to find out how much a country is growing, the population growth rate should be observed.

Usually developing countries have a positive or high natural increase rate. Developed countries have a negative/neutral or low natural increase rate [1], but many developed countries have their population increasing due to immigration despite their negative RNI.

The formula for the rate of natural increase is:

(Crude birth rate − Crude death rate) / 10, where birth and death rates are in per mil.

The result is the rate of natural increase in percentage form.

For example, Madagascar's crude birth rate (37.89) minus the crude death rate (7.97) is 29.92; divide that by 10 and the result is 2.992%, Madagascar's rate of natural increase.

See also

  • List of countries by natural increase

References

  1. ^ Human Population Growth – Kimball's Biology Pages

External links

List of current RNI in world states http://hdrstats.undp.org/en/indicators/138.html


Wikimedia Foundation. 2010.

Игры ⚽ Нужно сделать НИР?

Look at other dictionaries:

  • rate of natural increase — instantaneous rate of surplus production (equal to rate of growth plus rate of recruitment less rate of natural mortality all in terms of weight and on an instantaneous basis. In a balanced or equilibrium fishery, this increment replaces what is… …   Dictionary of ichthyology

  • instantaneous rate of natural increase — instantaneous rate of surplus production …   Dictionary of ichthyology

  • natural increase — The rate of population increase measured by subtracting mortality rate from natality rate …   Dictionary of invertebrate zoology

  • natural increase —   in population studies, when the birth rate is higher than the death rate …   Geography glossary

  • natural increase — internal growth, rate of population growth by childbirth …   English contemporary dictionary

  • natural decrease — The rate of population decrease measured by subtracting the natality rate from the mortality rate; see natural increase …   Dictionary of invertebrate zoology

  • Natural gas storage — Natural gas, like many other commodities, can be stored for an indefinite period of time in natural gas storage facilities for later consumption. Contents 1 Usage 2 Measures and definitions 3 Types 3.1 …   Wikipedia

  • Birth rate — Countries by birth rate in 2008 Not to be confused with Fertility rate. Crude birth rate is the nativity or childbirths per 1,000 people per year (in estimation review points).[1] Another word used interchangeably with birth rate is natality …   Wikipedia

  • instantaneous rate of surplus production — Equal to rate of growth plus rate of recruitment less rate of natural mortality all in terms of weight and on an instantaneous basis. In a balanced or equilibrium fishery, this increment replaces what is removed by fishing, and rate of surplus… …   Fisheries — dictionary

  • instantaneous rate of surplus production — Equal to rate of growth plus rate of recruitment less rate of natural mortality all in terms of weight and on an instantaneous basis. In a balanced or equilibrium fishery, this increment replaces what is removed by fishing, and rate of surplus… …   Fisheries — dictionary

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”