Numbers, Facts and Trends Shaping Your World

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    Evaluating Online Nonprobability Surveys

    Online nonprobability surveys are fast, cheap, and increasingly popular. We compared nine samples and found that accuracy varied substantially.

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    2. Accuracy in estimating multivariate relationships

    In addition to point estimates (e.g., % approving of President Barack Obama’s job performance), public opinion polls are often used to determine what factors explain a given attitude or behavior. For example, is education level or gender more predictive of Obama approval? This type of analysis involves testing the effects of multiple variables simultaneously. One […]