1. Moving average - Wikipedia

    https://en.wikipedia.org/wiki/Moving_average

    In statistics, a moving average (rolling average or running average) is a calculation to analyze data points by creating series of averages of different subsets of ...

  2. Volatility (finance) - Wikipedia

    https://en.wikipedia.org/wiki/Volatility_(finance)

    In finance, volatility (symbol ) is the degree of variation of a trading price series over time as measured by the standard deviation of logarithmic returns.