Follow the instructions in the user's guide or manual,particularly if are using the Number Cruncher Statistical System (NCSS ) which you can get from the net.
You can use NCSS in this link: http://www.ncss.com/software/ncss/
NCSS contains a comprehensive collection of statistical procedures for analyzing your data. These procedures cover a wide range of topics, including analysis of variance, clustering, correlation, curve fitting, cross tabulation, descriptive statistics, design of experiments, forecasting, time series, mass appraisal, meta-analysis, mixed models, multivariate analysis, nonparametric tests, operations research (linear programming), proportions, quality control, regression, survival, reliability, comparisons of means, and much more.