glossary * C *
Demographical and statistical terms  Symbols 
cause of death the disease or event that caused death. 

causespecific death rates the annual number of deaths from a given cause per 100000 midyear population . Causespecific rates are reported for sexage groups, local areas, and sometimes other categories. 

census a complete count or enumeration of a population conducted under the auspices of some governmental authority. This term denotes that an attempt was made to enumerate every member of the population concerned and to achieve complete coverage of the population. A micro census is limited to a sample of the population, usually large in size, and belongs in the category of sample surveys. Censuses or surveys are sometimes preceded by pretests or pilot surveys. 

central death rate at age x is the ratio of deaths between ages x and x+n to the mean population alive at that age. 
_{n }m _{x }; m(x) ; M(x) 
childbearing ages the span wěthin which women are capable of bearing children, generally taken to be from age 15 to age 49. 

childbirth is the actual process of expulsion of the foetus. (see delivery) 

childlessness refer to the state of a women, man or couple who have been so far infertile. 

childwomen ratio number of children aged 04 (or 59) per 1000 women of childbearing age ( f.e., 1549) at the time they born those children. 

closed population in which there is no migration either inwards or outwards and whose growth is determined solely by fertility and mortality, and therefore depends entirely on the difference between births and deaths. 

coding scheme the coding scheme establishes a correspondence between an entry and its translation into numeric or alphabetic codes. 

coefficient of determination estimates the fitting degree among observed data and theoretical data. 
R^{2 }or RR 
cohort denotes a group of persons who experience a certain event in a specific period of time. 

cohort fertility the fertility experienced over their lifetime of a group of women or men who form a birth or marriage cohort. 

cohort fertility rate fertility of real cohorts of women, obtained by tracing them longitudinally from year to year. Cohort rates may be agespecific or cumulative. For completed cohorts which have passed their 49^{th} birthday, it is possible to compute for each a general fertility rate, total fertility rate, and other summary measures. 

cohort life table records the actual mortality experience of a particular group of individuals (the cohort) from birth to the death of the last member of the group. 

completed fertility is the cumulative fertility until the date when all members of the cohort have reached the end of the reproductive period. 

complete lifetable a life table computed for every single year of age from birth to the oldest specified age. 

contraception this term refers to measure which are taken in order to prevent sexual intercourse or coitus from resulting in conception, or to the conscious effort of couples to avoid conception through rhythm, withdrawal, abstinence, male and female sterilization, or use of contraceptives: intrauterine devise (IUD), oral contraceptives, injectable contraceptives, condom, spermicide, and diaphragm. and female sterilization, or use of contraceptives: intrauterine devise (IUD), oral contraceptives, injectable contraceptives, condom, spermicide, and diaphragm. 

crude birth rate at time t when all live births are related to the entire population or subpopulation. 
b(t) or Br 
crude death rate at time t this is an annual rate and consists of the ratio of the annual number of deaths occurring during a calendar year per 1000 midyear population. 
d(t) or Dr 
crude divorce rate is given by the total number of the divorces in a year divided by the total number of person years lived by the population, or per 1000 midyear population. Similar rates may be considered setting in the denominator the number of persons above age 15, or the total number of exinting marriages (identical to the number of married men or women ) exposed to risk of divorce. 

crude emigration rate represents the amount of emigration per 1000 of the midyear population of a country 

crude first marriage rate is given by the total number of marriages of women or men in a year, divided by the number of person years lived by the single population of women or men. We have a similar rate when in the denominator is the single population of age groups that may legally marry (for convenience 15 is taken as minimum age). 

crude gross migration rate represents the amount of emigration plus immigration per 1000 of the midyear population of a country . 

crude immigration rate represents the amount of immigration per 1000 of the midyear population of a country . 

crude marriage rate is the total number of marriages divided by the total number of person years lived by the total midyear population, or by the population aged 15 or more. 

crude net migration rate represents the difference between immigration and emigration per 1000 of the midyear population of a country . 

crude rate of natural increase is the difference between the crude birth rate and the crude death rate 
r(t) 
crude remarriage rate represents the total number of remarriages in a year, divided by the sum of widowed and divorced men or women exposed to the possibility of remarriage. 

cumulative fertility it is obtained when the agespecific fertility rates are summed from the cohort's beginning of exposure to risk until some later date. 

cumulative net fertility represents the sum of the products of the fertility rates of the cohort by the probability of survival of the women to successive aged. 

current life table considers the mortality experience of a given population during one short period of time. 

curve fitting curve fitting consists of finding a suitable equation to represent the trend of the examined data 

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