JSTOR Daily

Sample-Size Formula for the Proportional-Hazards Regression Model

A formula is derived for determining the number of observations necessary to test the equality of two survival distributions when concomitant information is incorporated. This formula should be useful ...
JSTOR Daily

Mixed Effects Logistic Regression Models for Longitudinal Ordinal Functional Response Data with Multiple-Cause Drop-Out from the Longitudinal Study of Aging

In the context of analyzing ordinal functional limitation responses from the Longitudinal Study of Aging, we investigate the association between current functional limitation and previous year's ...
Investing

Gold Miners Are Benefitting From the Speculative Boom

As we noted in a recent article entitled The High Beta Melt Up: Echoes of 1999, there has been a notable change in investor preferences since the April lows. To wit: "What we do know is that, starting ...
Investopedia

What Is Variance in Statistics? Definition, Formula, and Example

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

Fama French Three Factor Model: How It Works, Formula, and Impact

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 ...