Number of Rows in Each Bin Specify the number of observations (rows) to include in each bin. To Specify the Number of Rows in Each Bin: Select Bin by number of rows as the Bin Method. Type a value directly into the text box of the Number of Rows in Each 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.