The issues addressed by the Housing Assistance Supply Experiment can only be resolved by attention to the context in which the allowance program operates; therefore a series of marketwide field surveys is scheduled for both sites. The sample design is a method for determining how many properties with various attributes should be surveyed. The strategy developed is a modified impact-gradient sampling plan, focusing survey resources on the sectors of the housing market most likely to be affected by the allowance program. Four variables--neighborhood density, housing tenure, housing cost, and size of structure--were used to define 16 sampling strata. Considerations site-specific to Brown County, and others applicable to property categories not covered in the basic sampling strata, bring the total number of strata to 21. The baseline panel of sample properties to be annually resurveyed will be chosen proportionately from this group.
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