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Questionnaire Dwelling Unit-Level and Person Pair-Level Sampling ...

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predicted mean(s), the neighborhood was ab<strong>and</strong>oned <strong>and</strong> the donor with the closest predicted<br />

mean(s) was chosen. 28 This was done to reduce the potential for bias.<br />

28 In surveys prior to 2006, this sometimes was incorrectly applied. In some cases, the neighborhood was<br />

not sorted by the predicted means, <strong>and</strong> in other cases, a donor was r<strong>and</strong>omly selected. There were also some<br />

situations where the donor with the closest predicted means was chosen with the delta constraint in place. These<br />

procedures were corrected in the 2006 survey.<br />

M-8

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