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Total fertility rate

150 bytes added, 04:44, 1 December 2013
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* It is the expected value of the fertility that a female would have if, at every age, she had the age-specific fertility rate observed for the current year (rather than the year when she'd actually be that age).
We use the term '''period fertility''' to describe the TFR because it is a form of [[period analysis]]: we are aggregating over people of different ages, all in a given period of time. This is in contrast with [[cohort analysis]], where we are looking at people who share a common temporal experience (such as birth, school attendance, or marriage) and study their behavior over their whole lifetime or a long part thereof.
===Total fertility rate for a particular birth order===
Note also that, whereas TFR numbers are scaled to 1 (i.e., they represent actual numeric values), GFR numbers are scaled to a denominator of 1000. If the GFR numbers were not scaled to a denominator of 1000, they would be much smaller than TFR values. Both the above points about the relationship in special cases become valid ''only after we rescale the GFR and ASFR values to a denominator of 1.''
 
==What do TFR values look like?==
 
===Gapminder data===
 
* {{gapminder key|phAwcNAVuyj0TAlJeCEzcGQ}}
* {{gapminder key|tGdhNYGTGtunwzkKJ9aRhsA}}
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