Statistical Terms Glossary

The pool of IBRD borrowings after July 1, 1982,used to set the pool-based variable lending rate. The lending rate is 50 basis points above the Bank's average cost of pool.

Lending rate system using the pool-based variable lending rate.

IBRD lending rate where the lending rate on all outstanding balances is adjusted every six months to achieve a given spread above the average cost of outstanding borrowings.

A loan included in the currency pooling system.

It means insecurity, powerlessness and exclusion of individuals, households and communities.

De facto population of a country, area or region as at 1 July of the year indicated. Figures are presented in thousands.

Three types of water-related diseases exist: (i) water-borne diseases are those diseases that arise from infected water and are transmitted when the water is used for drinking or cooking (for example cholera, typhoid); (ii) water-based diseases are those in which water provides the habitant for host organisms of parasites ingested (for example shistomasomiasis or bilharzia); (iii) water-related insect vector diseases are those in which insect vectors rely on water as habitat but transmission is not through direct contact with water (for example malaria, onchocerciasis or river blindness, elephantiasis).

Three types of water-related diseases exist: i. water-borne diseases are those diseases that arise from infected water and are transmitted when the water is used for drinking or cooking (for example cholera, typhoid); ii. water-based diseases are those in which water provides the habitant for host organisms of parasites ingested (for example shistomasomiasis or bilharzia); iii. water-related insect vector diseases are those in which insect vectors rely on water as habitat but transmission is not through direct contact with water (for example malaria, onchocerciasis or river blindness, elephantiasis).

The population that is exposed to the occurrence of a vital event, for example, the total population in the case of deaths or the legally-married population in the case of divorces.

De facto population as at 1 July of the year indicated for the age group indicated (presented in thousands), and the percentage of the total population that it represents. The population age groups are: 0-4, 0-14, 5-14, 6-11, 12-14, 15-17, 18-23, 15-24, 15-59, 15-64, 60 or over, 65 or over and 80 or over.

A population census is the total process of collecting, compiling, evaluating, analyzing and publishing or otherwise disseminating demographic, economic and social data pertaining, at a specified time, to all persons in a country or in a well delimited part of a country.

The difference between the size of the population at the end and the beginning of a period. It is equal to the algebraic sum of natural increase and net migration (including corrections). There is negative change when both of these components are negative or when one is negative and has a higher absolute value than the other.

Low population status.

Persons per square Kilometer.

Is the ratio between (total) population and surface (land) area. This ratio can be calculated for any territorial unit for any point in time, depending on the source of the population data. In the domain DEMO-R in New Cronos the population density is calculated using the average (mid-year) population.

Is the number of population per unit of total land area of a country.

Settlement and population distribution models.

Population distribution by marital status is the percentage distribution of the population (15+) in a given age group by the different marital status categories. Marital status is the personal status of each individual in relation to the marriage laws or customs of a country. The categories of marital status presented in World Marriage Data 2008 are: (1) single (never married); (2) married; (3) widowed; (4) divorced; and (5) married but separated.

The population employed in the informal sector comprises all persons who, during a given reference period, were employed in at least one informal sector unit, irrespective of their status in employment and whether it is their main or a secondary job.

Population equivalent (in waste-water monitoring and treatment) refers to the amount of oxygen—demanding substances whose oxygen consumption during biodegradation equals the average oxygen demand of the waste water produced by one person. For practical calculations, it is assumed that one unit equals 54 grams of BOD per 24 hours

Country estimates, disaggregated by sex, presented in a time series from 2000 until 2007.

The annual(ised) population growth over one or several years is calculated using the following formula
where: Pv = present value
P0 = beginning value
n = number of periods
100 can multiply the result in order to obtain a percentage

Average exponential rate of growth of the population over a given period because of the natural increase and net migration and is expressed as a proportion of the indigenous population.

It is the policy that the government, society, or group pursues to slow population growth by trying to reduce the number of births, and this may be called family planning policies.