Thursday, August 27, 2015

More on Fertility

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Parity Progression Ratio (PPR): 
PPR is the probability of having another child given that the another has reached certain parity (that means a certain number of children).
If a woman had already three births, then it is the probability of having the forth. If a woman had already two births, then it is the probability of having the third. If a woman had already one birth, then it is the probability of having the second.
Clearly PPR measures the likelihood of going from i to (i+1)th birth over the entire reproductive life span of the cohort.
PPR from i births to (i+1) births,

Need for fertility rate:
Fertility rate of a nation has been a matter of interest for the demographers all over the world. Information of fertility can help in finding out different measures so that we can know about the population growth, population pattern and also it helps us in other studies related to population projection.

Fertility Differentials:
It is well known that there is a relationship between the level of development of a society and its level of fertility. Some variables are responsible for fertility.
As for example,
i. Age at marriage
ii. Urbanization
iii. Education
iv. Female work participation
v. Family type
vi. Type of marriage (monogamous, polygamous)
These variables are bearing casual relationship to fertility.

Birth Order:
In demography, live birth order of a woman is classified according to her order
i.e. 1st order birth,
2nd order birth.

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