Numbers, Facts and Trends Shaping Your World

Search results for: “results”

  • report

    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 […]

  • report

    1. Assessing the accuracy of online nonprobability surveys

    To better understand the current landscape of commercially available online nonprobability samples, Pew Research Center conducted a study in which an identical questionnaire was administered to nine samples supplied by eight different vendors along with the Center’s probability-based online panel. A benchmarking analysis – in which a subset of each survey’s results was compared to […]