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 ...

Dispersion is a fundamental measure of risk and opportunity in the stock market; it measures how differently stocks are performing, or are expected to perform. The Dispersion Index was launched in ...

The total quantity of metal available for the reaction needs to be measured to characterize a catalyst sample. The available metal is measured in terms of a percentage of the total number of surface ...

Lasers that transmit data on optical fibers do not produce monochromatic light. Instead, they provide a narrow spectrum that includes many wavelengths. The physical characteristics of optical fibers ...