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, ...

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 ...

Analytical methods for detecting opium alkaloids such as morphine, codeine, thebaine, papaverine and noscapine play a critical role in food safety, public health and forensic toxicology. These ...

Power analyses and sample size calculations are important parts of many research projects. Often, before data are even collected, it is necessary to calculate and justify the required sample size for ...

The analysis of trace elements in geological samples underpins our understanding of crustal evolution, mineral exploration and environmental monitoring. Trace elements, present at concentrations ...

Forbes contributors publish independent expert analyses and insights. Dr. Lance B. Eliot is a world-renowned AI scientist and consultant. In today’s column, I share and mindfully explore a newly ...