The main types of non-response are no contact and refusal. In Chapter 2, we discuss some theories for these types of non-response. In addition, we present an overview of the characteristics associated ...

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 ...

A growing share of polling is conducted with online opt-in samples. 1 This trend has raised some concern within the industry because, while low participation rates pose a challenge for all surveys, ...

The purpose of the Netherlands Working Conditions Survey (NEA) is to collect data on working conditions, accidents at work, work content, workplace relations and the employment conditions of workers.