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Difference between revisions of "Residual"

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(Eugen Grebenik et al., first edition 1958)
(Eugen Grebenik et al., first edition 1958)
 
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<noinclude>
 
<noinclude>
[[en-I:residual]] [[ar-I:طريقة البواقي (باق)]] [[cs-I:migrační saldo]] [[de-I:Restbetrag]] [[es-I:residuo]] [[fi-I:jäännöksenä]] [[fr-I:résidu]] [[it-I:residuo]] [[pl-I:metoda reszt (mierzenie migracji)]] [[pt-I:RESÍDUO]] [[ru-I:Числа остаточные]]  
+
[[en-I:residual]] [[ar-I:طريقة البواقي]] [[cs-I:migrační saldo]] [[de-I:Restbetrag]] [[es-I:residuo]] [[fi-I:jäännöksenä]] [[fr-I:résidu]] [[it-I:residuo]] [[pl-I:metoda reszt (mierzenie migracji)]] [[pt-I:RESÍDUO]] [[ru-I:Числа остаточные]]  
 
</noinclude>
 
</noinclude>
 
{{DEFAULTSORT:Residual}}
 
{{DEFAULTSORT:Residual}}

Latest revision as of 08:10, 11 February 2010

Residual  (RESIDUAL)


Where it is not possible to determine migration directly, the indirect measurement of migration1 involves estimates obtained by the residual2 method, in which the change in population between two dates is compared with the change due to natural growth and the difference between the two figures attributed to migration. The vital statistics technique3 consists of computing the difference between total population change and natural increase (701-7). In the survival ratio technique4 the death rates of the inter-censal period are applied to age (326-5) the census population and to give the expected population at the end of the period. A comparison between the observed and the expected population may be used to estimate the balance of migration by age. If it were possible to obtain data on either net or gross migration and on the mean population of the area concerned, migration rates5 showing the incidence of migration could be computed. In practice, however, it is extremely difficult to specify the population at risk and such rates are therefore rarely used.
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