Summary Statistics

The statistics for your data set can be inspected using the Summary: Summary Data drop down.

This will open the General Statistics window, which gives statistics for the data set as a whole, for the Species, and for the Samples; you can select which set of statistics to view from the bottom bar of the General Statistics window.

These grids are sortable. To sort any column click on the topmost cell to activate the sort function. Clicking again will sort in the other direction, the third click will turn off sorting.

No. of species (rows) - This is the number of rows of data in the data set.

No. of samples (cols) - This is the number of columns in the data set.

No. of zero cells - This is the number of zero entries in the data matrix.

Non-Zeros - The number of non-zero entries

% Zeros - (Number of zeros/Total number of cells)*100

Maximum value - This is the maximum value in the data matrix.

Minimum value - This is the minimum value in the data matrix.

Range - This is the difference between the maximum and minimum values.

Mean - This is the mean of all the values in the data matrix.

Standard deviation - This is the standard deviation of all the values in the data matrix.

Median - This is the median of all the values in the data matrix.

To examine the statistics for each sample click on Samples at the bottom of the window.

This will display statistics for each sample.

The statistics for the samples can be displayed in similar fashion by clicking on Species.

Mean - This is the mean of all the values in each row or column of the data matrix.

Median - This is the median of all the values in each row or column of the data matrix.

Max - This is the maximum value in the data matrix.

Min - This is the minimum value in the data matrix.

Zeros - The number of zero entries in the data matrix

Non-Zeros - The number of non-zero entries

% Zeros - (Number of zeros/Total number of cells)*100

Sum - This is the sum of all the values in each row or column of the data matrix.

SumSqr - This is the sums of squares of all the values in each row or column of the data matrix.

Skewness - This is the skewness of all the values in each row or column of the data matrix.

Kurtosis - This is the kurtosis of all the values in each row or column of the data matrix.

For Samples only

Total Variance - This is the variance of all the values in each column of the data matrix.

Sample Variance - This is the estimate of the variance of all the values in each column of the data matrix.

For Species Only

Variance - This is the sample variance of all the values in each row of the data matrix.

Dispersion (I) - The dispersion statistic ie the variance over the mean.

Chi of I - The chi value of the dispersion statistic.

Dispersion Model - Whether the dispersion is random, aggregated or uniform.