This parameter is essentially a per capita growth rate, and is calculated as: r = b-d. "r" is variously referred to as the "rate of natural increase" or the "per capita rate of increase" of the population, or as the "rate of net reproduction per individual."
To determine per capita birth or death rates, you simply divide the absolute number of births ("B") or deaths ("D") by the number in the population ("N") at the midpoint of the time interval (usually year). By convention, for human demographics, we use the total number ("N") of people, regardless of age or sex.
Intrinsic rate of increase. The rate at which a population increases in size if there are no density-dependent forces regulating the population is known as the intrinsic rate of increase.
Birth rate is a parameter of the entire population, while fertility rate is a parameter of a group of individuals in the population. Fertility rate determines the birth rate but, not the other way around. Fertility rate applies for females in the reproductive age, but there is no such restriction for birth rate.
The annual percentage growth rate is simply the percent growth divided by N, the number of years. In 1980, the population in Lane County was 250,000.
The term for population growth rate is written as (dN/dt). The d just means change. K represents the carrying capacity, and r is the maximum per capita growth rate for a population. Per capita means per individual, and the per capita growth rate involves the number of births and deaths in a population.
Exponential growth is continuous population growth in an environment where resources are unlimited; it is density-independent growth. dN/dt = rN where, dN/dt = change in population size; r = intrinsic rate of increase (= per capita rate of increase and equals birth rate minus death rate); N = population size.
The net migration rate is the difference between the number of immigrants (people coming into an area) and the number of emigrants (people leaving an area) throughout the year. When the number of immigrants is larger than the number of emigrants, a positive net migration rate occurs.
Per capita income, also known as income per person, is the mean income of the people in an economic unit such as a country or city. It is calculated by taking a measure of all sources of income in the aggregate (such as GDP or Gross national income) and dividing it by the total population.
Exponential growth is continuous population growth in an environment where resources are unlimited; it is density-independent growth. dN/dt = rN where dN/dt = change in population size; r = instrinsic rate of increase (= per capita rate of increase and equals birth rate minus death rate); N = population size.
|(Crude) live birth rate =||Total number of live births Total population||1,000|
|Postneonatal mortality rate =||Number of postneonatal deaths Total number of live births||1,000|
|Infant mortality rate =||Number of infant deaths Total number of live births||1,000|
Doubling time is the amount of time it takes for a given quantity to double in size or value at a constant growth rate. We can find the doubling time for a population undergoing exponential growth by using the Rule of 70. To do this, we divide 70 by the growth rate (r).
To find that rate, simply divide the number of murders by the total population of the city. To keep from using a tiny little decimal, statisticians usually multiply the result by 100,000 and give the result as the number of murders per 100,000 people.
Per capita GDP is a measure of the total output of a country that takes the gross domestic product (GDP) and divides it by the number of people in that country. A rise in per capita GDP signals growth in the economy and tends to reflect an increase in productivity.
A life history in which adults produce large numbers of offspring over many years; also known as iteroparity. Term. reproductive table. Definition. An age-specific summary of the reproductive rates in a population.
When resources are limited, populations exhibit logistic growth. In logistic growth, population expansion decreases as resources become scarce, leveling off when the carrying capacity of the environment is reached, resulting in an S-shaped curve.
How to Calculate Crude Birth Rate
- Divide Midyear Population. The crude birth rate (CBR) is equal to the number of live births (b) in a year divided by the total midyear population (p), with the ratio multiplied by 1,000 to arrive at the number of births per 1,000 people.
- Write Out the Formula.
- Sample Equation.
The carrying capacity of a biological species in an environment is the maximum population size of the species that the environment can sustain indefinitely, given the food, habitat, water, and other necessities available in the environment.
Types. There are three types of population pyramids: expansive, constrictive, and stationary. Expansive population pyramids depict populations that have a larger percentage of people in younger age groups. Populations with this shape usually have high fertility rates with lower life expectancies.