Statistics>> Standardized Death Rate
Sometimes it is not possible to compare the C.D.Rs. in two regions as the actual age distribution in one region may differ from another region. For the purpose of comparison the rates are brought on same standard basis by computing standardised death rate. The standard population for this purpose may be taken as the population of the country or some other population may be taken as the standard.
There are two methods of standardization -Direct method and indirect method.
Direct Method
Suppose we want to compare the mortality of two regions A and B. The C.D.R. in terms of annual-AS DR for region A and B are given by
Now if
is the number of persons at age Pbxin the standard population, then
The direct method is very simple but the choice of the standard population affects the magnitude of the standardised death rate.
Indirect Method
Sometimes one comes across a situation in which the specific death rates of a population are not known but the distribution of population in various age groups is known. In such a case, an indirect method is adopted. Here approximate standardised death rate of the population is calculated by the relation
S1半径标注= CDRAX F
where F = correction factor
= S1DR/CDR
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