Financial word of the day: Heteroscedasticity describes a situation where risk (variance) changes with the level of a ...

Count data modelling occupies a central role in statistical applications across diverse disciplines including epidemiology, econometrics and engineering. Traditionally, the Poisson distribution has ...

Statistical dispersion quantifies the variability of data relative to a central tendency, most commonly the mean, with variance the most usual measure of this. More generally, dispersion metrics are ...

Introduction -- Distributors -- Introduction to measures of central value and dispersion -- Population and sample -- The normal distribution -- Statistical inference: estimation and tests -- Inference ...

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 ...

Mary Hall is a editor for Investopedia's Advisor Insights, in addition to being the editor of several books and doctoral papers. Mary received her bachelor's in English from Kent State University with ...