Most stock quote data provided by BATS. US market indices are shown in real time, except for the S&P 500 which is refreshed every two minutes. All times are ET ...

A simple random sample is a subset of a statistical population where each member of the population is equally likely to be ...

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 ...

We independently review everything we recommend. When you buy through our links, we may earn a commission. Learn more› By Leta Shy Leta Shy is an editor overseeing Wirecutter's lifestyle categories.

Abstract: This letter proposes to derive the success probability of Sybil attack in online social networks with the multiple-choice majority voting. The resultant SybilVote formulas produce outputs ...

Abstract: A model of a burst-noise binary channel uses a Markov chain with two states G and B. In state G, transmission is error-free. In state B, the channel has only probability h of transmitting a ...

Results are updated daily by 9:30 a.m. EST and aggregated from the most recent polls from the sources listed in the methodology section below. Think we're missing something? Email us. This page covers ...

State and federal government websites often end in .gov. Before sharing sensitive information, make sure you’re on an official government site. The site is secure. The https:// ensures that you are ...