Volatility power rankings are rankings between Mid Term Volatility and Short Term Volatility U.S.-listed ETFs on certain investment-related metrics, including 3-month fund flows, 3-month return, AUM, average ETF expenses and average dividend yields. The metric calculations are based on U.S.-listed ETFs that are classified by ETF Database as being either Mid Term Volatility or Short Term Volatility. If an ETF changes its volatility classification, it will also be reflected in the investment metric calculations. The calculations exclude all other asset classes and inverse ETFs.