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glossary * O *
| Demographical and statistical terms | Symbols |
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open population an open population is one where migration is a significant component of population change, either in size or composition, or both. |
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order-specific total fertility rate is given by the summation of age-specific fertility rates order by order. |
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order-specific fertility rate number of live births of a given birth order (1,2,3, and so on) occurring in a year, per 1000 women in the childbearing ages. |