Estimating Extent and Proportions

Estimating Extent

Wi = final design weight for site i
Zi = indicator data value for site i
n = actual sample size

Pm = estimated proportion in category m

Sum[Wi] Sum is over all sites in category m
Pm = --------------------------------------------------------------
Sum[Wi] Sum is over all sites (i = 1 to n)

Extentm = Pm x Total Population extent

Estimates Proportion < B

Pm = estimated proportion < B in category m

Sum[Wi] Sum is over all sites (proportion < B) in category m
Pm = --------------------------------------------------------------
Sum[Wi] Sum is over all sites (i = 1 to n)

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Estimating Extent and Proportions

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