Forex Ninja - Currency Trader Tools & Apps Linear Regression Channels Indicator for Metatrader 4 | Forex Ninja - Currency Trader Tools & Apps: Linear Regression Channels Indicator is a custom built indicator for Metatrader 4 that graphically displays the linear regression line and a variable number of outside regression channels. The indicator updates automatically on your chart with the latest candle or bar to conform to the latest real-time price data.