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How are the smoothed lines in the indices plots calculated?

April 26, 2017calculated indices plots smoothed

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How are the smoothed lines in the indices plots calculated?

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The red smoothed line in the plots is calculated using the lowess smoother function in the statistical Open Source package R (with parameters: f=1/5, iter=3). References: R-project website at http://www.r-project.org Becker, R.A., Chambers, J.M. and Wilks, A.R. (1988). The New S Language. Wadsworth & Brooks/Cole. Cleveland, W.S. (1979). Robust locally weighted regression and smoothing scatterplots. J.Amer.Statist.Assoc., 74, 829-836. Cleveland, W.S. (1981). LOWESS: A program for smoothing scatterplots by robust locally weighted regression. The American Statistician, 35, 54.