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Mourning band definition, a piece of black cloth that is worn, especially as a band encircling the upper arm, to indicate mourning. See more.
Standard Error Bands. Standard Error Bands show trend direction and price volatility around the trend. There are three components to Standard Error Bands: 1  Smoothed Linear Regression Line: Generally a 21-period linear regression curve that is smoothed by a 3-period simple moving average.2  Upper Standard Error Band: The linear regression line plus 2 standard errors. When the Standard Error Bands begin to expand, then the trend is expected to end and either consolidate into a non-trending market or reverse trend.