Number of Iterations Use this option to specify the number of samples for the Markov chain simulation. To Specify the Number of Iterations: Either type the desired value in the text field or move the slider to the right or to the left to specify a 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.