Area compatibility factor
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- is the standardised central exposed to risk from age x to x + t for the standard population,
- is the central exposed to risk from age x to x + t for the population under study and
- is the mortality rate in the standard population for ages x to x + t.
The expression can be thought of as the crude mortality rate for the standard population divided by what the crude mortality rate is for the region being studied, assuming the mortality rates are the same as for the standard population.
F is then multiplied by the crude mortality rate to arrive at the indirectly standardised mortality rate.
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