Negative margin status is an important predictor for local control and overall outcome in head and neck cancers. 1, 2, 3 Frozen section analysis is a useful tool for assessing margin status ...

Will Kenton is an expert on the economy and investing laws and regulations. He previously held senior editorial roles at Investopedia and Kapitall Wire and holds a MA in Economics from The New School ...

A behind-the-scenes blog about research methods at Pew Research Center. For our latest findings, visit pewresearch.org. Academic survey researchers tend to differ ...

Adam Hayes, Ph.D., CFA, is a financial writer with 15+ years Wall Street experience as a derivatives trader. Besides his extensive derivative trading expertise, Adam is an expert in economics and ...

Behavioural research requires the use of sampling methods to document the occurrence of responses observed. Sampling/recording methods include ad libitum, continuous, pinpoint (instantaneous), and one ...

Consider a population of 70 individuals, for which you wish to estimate the mean annual income, μ. Assume that you have decided to use the following estimation procedure to make your estimate: simple ...

Stratified mean-per-unit sampling is a key tool used by auditors. The popularity of this statistical procedure arises from its unique ability to produce trustworthy ...

During microvolume measurements, incorrect measurements can result if the liquid sample is not bridged throughout the entire measurement cycle. Microvolume spectrophotometers are unique instruments ...

Because power plant operating decisions often rely on water and steam chemistry information, a properly designed and operated water and steam sampling system must be in place to ensure accurate ...