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Abstract: This
working paper documents the power analysis, literature review, and precision
considerations contemplated in designing the Anchorage Community Survey’s
(ACS) 2007 sampling design. The ACS will obtain at least 30 completed
surveys from individuals in each of the 55 census tracts that make up
the Anchorage Municipality, allowing us to discern a fairly small effect
size of 0.30 with our smallest anticipated intraclass correlation and
a moderate effect size of 0.40 with our largest anticipated intraclass
correlation, both at 0.80 power level. This cluster sample size and number
of clusters should yield sufficient precision to allow good estimation
of variance components and standard errors, acceptable reliability estimates,
and reasonable aggregated measures of constructed neighborhood variables
from individual survey item responses. |
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