A semi-parametric generalization of the proportional hazards regression model is defined, whereby the hazard functions can cross for different values of the covariates. In the two-sample comparison, ...

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 ...

Investopedia contributors come from a range of backgrounds, and over 25 years there have been thousands of expert writers and editors who have contributed. Robert Kelly is managing director of XTS ...

As sports betting has become increasingly popular, it's important to understand what you’re betting on, who to bet with but also what do betting odds mean and how they can differ. Understanding how ...

Background Stroke volume is an established echocardiographic marker but has not been widely studied in patients with ...

Stocks: Real-time U.S. stock quotes reflect trades reported through Nasdaq only; comprehensive quotes and volume reflect trading in all markets and are delayed at ...

The provincial Liberals plan to introduce legislation this fall that would ban children under 16 in Nova Scotia from using social media platforms. Liberal House leader Iain Rankin said the bill would ...

The Detroit Lions were one of the NFL's most dynamic offenses last season, with Dan Campbell's stars quickly becoming Fantasy football staples. Jared Goff, Jahmyr Gibbs, David Montgomery, and Amon-Ra ...