Hold-Out Size, Specify as: Use the radio buttons to specify the way to quantify the number of observations to hold out. Available methods for quantifying the number of observations to hold out are described in the table below: Method Description K for K-Fold or 1/K K = The number of folds or Groups in a partition L for Leave-L-Out L = The number of observations to leave out P for P-Percent-Hold-Out P = The percentage of observations to hold out Note : If N is the number of observations, then 1/ K = L / N = P /100. To Specify a Method for Holding Out Observations: Select the desired method by clicking within the appropriate radio button. Specify the numerical value using the appropriate parameter below.