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After the field data are collected, Knowledge Networks further adjusted the sampling weight to account for survey non-response. The correction for survey non-response is analogous to the adjustment for differences in the Internet/WebTV panel from the U.S. population. It was based on geographic and demographic characteristics known for both the sample of panel survey completes and the entire sampling frame for the study. The weighting scaled up under-represented population dimensions and scaled down over-represented dimensions in the sample of survey completes. This more closely aligned the sample of survey completes with the basic demographic characteristics of the entire sampling frame for the study.

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