Statistics Window

The Statistics Window can display statistics for the values in each of the table's columns. The calculated values are displayed in a JTable widget with a row for each column in the main table, and a column for each of a number of statistical quantities calculated on some or all of the values in the data table column corresponding to that grid row:

Name

The name of the column in the main table represented by this grid row.

Mean

The mean value of the good cells.

S.D.

The standard deviation of the good cells.

Minimum

The minimum value. For numeric columns the meaning of this is quite obvious. For other columns, if an ordering can be reasonably defined on them, the 'smallest' value may be shown. For instance string values will show the entry which would be first alphabetically.

Maximum

As minimum, but shows the largest values.

Good cells

The number of non-blank cells.

Bad cells

The number of blank cells; the sum of this value and the Good cells value will be the same for each column.

Subset selection

The quantities displayed in this window are not necessarily those for the entire table; they are those for a particular Row Subset.

At the bottom of the window is a selector button which allows you to select which subset you want the calculations to be done for. By clicking on this you can calculate the statistics for different subsets.

When the window is first opened, or when it is invoked from a menu or the toolbar in the main browser window, the subset will correspond to the active subset in the main window.

Toolbar

Recalculate

Once statistics have been calculated for a given subset they are cached and not normally recalculated again. Use this button if you want to force a recalculation because the data may have changed.
Also available as the Recalculate item on the Statistics menu.

Progress Bar

For a large table the calculations may take a while. While they are being performed you can interact with the window as normal, but a progress bar is shown at the bottom of the window. If you initiate a new calculation (by pushing the Recalculate button or selecting a new subset) or close the window during a calculation, the superceded calculation will be stopped.