Number of Representative Markers Use this field/slider to specify the number of clusters to generate. To Specify the Number of Linkage Groups: Check the Use K-Means clustering to reduce number of markers check box. Make sure that the Automated K-Means option is selected in the K-Means Clustering Method parameter. Either type the desired value into 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 Rescale Slider from the pop-up menu. Change the upper and/or lower boundaries in the window that appears, to rescale the slider and click OK.