Subsequent iterations perform iterative reweighting. Such iterations are appropriate when there are outliers in the data or when the error distribution is a symmetric long-tailed distribution.
Either type the desired value (an integer between 1 and 20 ) in the text field, or move the slider to the right or to the left to change the value.Tip : To change the scale of the slider, right-click on the slider and select from the pop-up menu. Change the upper and/or lower boundaries in the window that appears, to rescale the slider and click .