Simply collecting data is not enough. You can fill spreadsheets with data, but it's useless if you can't act on it. Regression is one of the most powerful statistical tools for finding relationships ...

Several graphical techniques for checking the proportional-hazards assumption of Cox's semiparametric regression model for censored survival data are discussed, and some numerical tests to support the ...

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 ...

(1) Competitive relationships among Amaranthus retroflexus L., Chenopodium album L., Echinochloa crus-galli L., and Solanum nodiflorum Jacq. were investigated under field conditions by replacement ...

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 ...