Percentage of Data to Be Trimmed before Summary [0,50] Use the text box to specify the percentage of data to be trimmed from both the high and low ends before summarizing and rescaling. Note: This parameter is available only if the Select Training subset based on Missing status box is checked. To Specify the Percentage of Data to Be Trimmed before Summary: Check the Select Training subset based on Missing status box. Type the desired value in the text field.