Human interactions play an important role in determining the potential transmission routes of infectious diseases and other contagion phenomena 1. Their measure and characterization represent an ...

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 ...

In many situations there is interest in parameters (e.g., mean) associated with the response distribution of individual clusters in a finite clustered population. We develop predictors of such ...