Width of Positional Bin Specify the width of each positional bin on the same scale as the physical Position Variable. To Specify the Width of Positional Bin: Select Bin by position as the Bin Method. Type a width value directly into the text box of the Width of Positional Bin field, or left-click and drag the slider to the left or right. If necessary, you can right-click in the slider box to rescale it.