Pew Research Center designed this study to assess the current state of online survey sampling methods – both probability-based and opt-in – and determine their accuracy on general population estimates ...

Sampling is often used in evaluation as an economical and efficient means of estimating population parameters. Among the approaches to sampling traditionally used, few provide the apparent flexibility ...

The Committee on National Statistics held a 2-day public workshop on estimating the prevalence of human trafficking in the United States on April 8-9, 2019. The workshop explored current and ...