Metric Specify the metric you want to use when computing distances between groups. Your choices are described below: Metric Definition Linear Choose Linear if there is a common, pooled, covariance matrix for the groups. Quadratic Choose Quadratic if each group has its own covariance matrix. Note : You should choose this metric only if the number of observations in each group exceeds the number of predictors . Regularized Choose Regularized as a compromise method. Note : This option is available only in Interactive Mode . To Specify the Metric: Select the desired metric by clicking within the appropriate radio button.