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Multilingual Demographic Dictionary, second unified edition, English volume
Hypothetical cohort
| Translation | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Section | English 713 |
Arabic 713 |
Czech 713 |
German 713 |
Spanish 713 |
French 713 |
Italian 713 |
Japanese 713 |
Portuguese 713 |
Russian 713 |
Chinese 713 |
| 713-1 | mean length of a generation —mean interval between successive generations |
مدة الجيل—متوسط فترات الأجيال المتعاقبة | interval, mezi následujícími generacemi | durchschnittliche Generationendauer —durchschnittlicher Generationenabstand |
intervalo medio entre dos generaciones sucesivas | intervalle entre générations successives | durata media di una generazione —intervallo medio fra generazioni successive |
平均世代間隔 | duração média de uma geração —intervalo médio entre gerações sucessivas |
Средняя длина поколения —Средний интервал между смежными поколениями |
平均代际长度 —平均世代间隔 |
| 713-2 | mean age of mothers | عمر المتوسط للأمهات | průměrný věk matek | durchschnittlicher Alter der Mütter bei der Geburt ihrer Kinder | edad media de las madres | âge moyen des mères | età media delle madri | 母親の平均年齢 | idade média das mães | Средний возраст матери | 母亲的平均年龄 |
| 713-3 | hypothetical cohort —synthetic cohort |
أجيال وهمية—أجيال فرضية | fiktivní generace | hypothetische Kohorte | generaciones hipotéticas —generaciones ficticias |
génération fictive —génération hypothétique |
generazione fittizia —generazione ipotetica |
仮説コウホート —合成コウホート |
coortes hipotéticas —coortes sintéticas —coortes fictícias |
Гипотетические поколения —Фиктивные поколения |
假设同批人 —综合同批人 |
The net reproduction rate (711-3) and the intrinsic rate of natural increase (703-1) are closely related to one another. The net reproduction rate measures the increase in the stable population (703-2) implied by the given age-specific fertility and mortality rates over a period equivalent to the mean length of a generation 1 or the mean interval between successive generations 1. This length of a female generation is equal to the mean age of mothers 2 giving birth to live daughters, with current age-specific fertility and mortality rates. Period reproduction rates are current indices (cf. 152) which relate to hypothetical cohorts 3 or synthetic cohorts 3.
- 2. The mean age of fertility, i.e., the mean age of the fertility schedule is only approximately equal to the mean length of a generation. The mean length of a male generation similarly is equal to the mean age of fathers at the birth of their children.
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