Dear,

I am using EpiInfo to analysis survey data.

However there some issues that I still do not know how to figure out. What is the formula used to compute the Population survey. I found one n = [DEFF*Np(1-p)]/ [(d2/Z21-α/2*(N-1)+p*(1-p)]. But I do not know how to estimate the "Np". What makes NP different from N ?

Supposing that I have

DEFF= 1

p=5%

d=4%

Z=1.96 and

N=2500

Trying this I have a sample size of 484 from EpiInfo.

Please could you help me.

Kind regards,

Evans,

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