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Post a reply: Is it necessary to take sampling weight into consideration?

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Background: I have incidence rates from different surveys, done in different zones of a region. I want to combine the results of several zones so as to make a general statement about the region. I do understand that the denominator of the incidence rate takes into account the sample size and exposure time. 

Confusion: Is weighing each of the estimates ( say using sample weight ) necessary given that the denominator has already taking care of the differences in sample size and exposure period?

Secondly, I want to know, if necessary, how to incorporate sample precision into this process? 

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