glossary    * F *
Demographical and statistical terms Symbols
family
consists of two or more persons related to each other by blood, marriage, or adoption. A residential family is one that occupies a housing unit as living quarters. In such a case, the household head is also the head of the family. The collectivity of related persons in sometimes called a "primary" family.
 
family demography
concerns itself with the structure of families and household (i.e.,their size, composition, and distribution) and the family-related events such as marriage and divorce, that alter this structure through their number, timing and sequencing.
 
family life cycle
this term is frequently used to describe a sequence of life events from birth to death, though its more precise meaning refers to a sequence of parenthood stages over the life course, from birth of the children through their departure from the home to their own childbearing .
 
fecundity
is a measure of the maximum number of children which a woman is physically capable of producing, or the capacity of a men, a women or a couple to produce a live child.
 
female fertility rates
are fertility rates (see) calculated for groups of women.
 
fertility
is a measure which refers to the number of children borne by a woman.
 
fertility histories
are accounts obtained for individual women of the important events in their reproductive lives, such as marriage, pregnancy, births, infant deaths, etc. and their dates. Fertility histories are often obtained retrospectively from survey.
 
fertility lifetime
is the cumulative fertility until the date when all members of the cohort have reached the end of the reproductive period.
 
fertility rate
is a rate calculated by relating the number of live births observed in a population or sub-population during a given period to a group of individuals of the same sex in the riproductive ages. The denominator is commonly the mid-year population in the stated period, but it may also be the number of years lived by the group during the period, or the mean size of the group.
 
foetal death
is death prior to the complete expulsion or extraction from its mother of a product of conception , irrespective of the duration of pregnancy; the death is indicated by the fact that after such separation the foetus does not breathe or show any other evidence of life, such as beating of the heart, pulsation of the umbelical cord, or definite movement of voluntary muscles. Late foetal deaths are those of twenty- eight or more completed weeks of gestation.
 
force of mortality or instantaneous rate of mortality
see " instantaneous death rate".
m (x)
forward survival
procedure for estimating the age distribution at some later date by projecting forward an observed age distribution. The procedure uses survival ratios, often obtained from model life table. The procedure is basically a form of population projection without the introduction of new entrants (births) to the population.
 
fraction of the last interval of age lived
represents the part of the last year lived by those who die at each age.
h(x) or H(x)

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