Data set statistics 
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Summary statistics for both the raw and working data sets are displayed by clicking on the Summary tab.
You can choose summary statistics for either the raw or working data sheets. Statistics can be generated for Rows, columns and general summary statistics for the data. These statistics are particularly useful prior to undertaking many analyses. For example analyses should not be undertaken on a data set that comprises large numbers of zeros. Use Summary statistics to determine the number of zero elements in your data.
To obtain general statistics on the raw data select the Raw Data radio button in the 'Use' panel situated below the grid to select Raw Data. Statistics for the individual rows and columns of either the raw or working data matrix are selected using the Statistics radio buttons situated below the grid.
Values for each row or column are shown numbered in the order they appear in the original data matrix. The statistics calculated are as follows: Mean  This is the mean of all the values in the data matrix. Median  This is the median of all the values in the data matrix. Max  This is the maximum value in the data matrix. Min  This is the minimum value in the data matrix. Zeros  This is the number of zero entries in the data matrix. Nonzeros  This is the number of nonzero entries in the data matrix. % Zeros  (Number of zeros/Total number of cells) * 100 Sum  This is the sum of all the values in each row or column in the data matrix. SumSqr  This is the sums of squares of all the values in each row or column in the data matrix. Variance  This is the variance of all the values in each row or column in the data matrix. Skewness  This is the skewness of all the values in each row or column in the data matrix. Kurtosis  This is the kurtosis of all the values in each row or column in the data matrix.
