A behind-the-scenes blog about research methods at Pew Research Center. For our latest findings, visit pewresearch.org. Pew Research Center has a long history measuring the public’s knowledge about ...

Pew Research Center’s survey on international knowledge covers facts about global leaders, international institutions and geography, among other topics. The following criteria are used to evaluate how ...

The authors compare the results of international comparisons of the economic level, applying various methods; they range the causes of their differences in three types: 1. difference in the scale of ...

Background: Numerical rating scales (NRS), and verbal rating scales (VRS) showed to be reliable and valid tools for subjective cancer pain measurement, but no one of them consistently proved to be ...

The number on the scale does not tell the whole story. Your body weight does not account for your body fat, muscle mass and bone density, and will not tell how much of it is due to water retention or ...