Teens-and-Mobile-Phones (1)

8 this means that in 95 out every 100 samples drawn

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Unformatted text preview: to complete the parent interview. Those who were not parents were screened -out as ineligible. For both samples, after the parent interview was complete, an interview was completed with the target child. Data was kept only if the child interview was completed. Weighting and analysis Weighting is generally used in survey analysis to compensate for patterns of nonresponse that might bias results. The interviewed sample was weighted to match national parameters for both parent and child demographics. The parent demographics used for weighting were: sex; age; education; race; Hispanic origin; and region (U.S. Census definitions). The child demographics used for weighting were gender and age. These parameters came from a special analysis of the Census Bureau ’s 2008 Annual Social and Economic Supplement (ASEC) that included all households in the continental United States. Weighting was accomplished using Sample Balancing, a special iterative sample weighting program that simultaneously balances the distributions of all variables using a statistical technique called the Deming Algorithm . Weights were trimmed to prevent individual interviews from having too much influence on the final results. The use of these weights in statistical analysis ensures that the demographic characteristics of the sample closely approximate the demographic characteristics of the national population. Table 1 compares weighted and unweighted sample distributions to population parameters. Table 1...
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