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Gamma Statistic

Select menu: Stats | Statistical Tests | Gamma Statistic

The gamma statistic of agreement assesses the agreement between two variables measured using ordinal scales.

  1. After you have imported your data, from the menu select 
    Stats | Statistical Tests | Gamma Statistic.
  2. Fill in the fields as required then click Run.

After running, you can save the results by clicking Save.

In Genstat these are each represented as factors whose levels represent a ranking of the individuals according to some measurement. For example, suppose we have a factor A with R levels and a factor B with K levels. The data then consists of an R by K table classified by A and B, whose entries indicate the number of times that the ith level of variable A occurs with the jth level of variable B. The table must not contain any missing values. The statistic has the value 1 when there is no disagreement in the ordering of the variables, -1 if the ordering defined by A has no disagreement with the reverse of the ordering defined by B, and zero if the variables are independent.

Available data

This lists tables that can be used as data for the test. Double-click a name to copy it into the input field, or type the name in directly.


Specifies a two-way table containing the data.

Create table

Lets you create a table either by using existing factors or by using a blank spreadsheet.


Two-sided Select this option if you want a two-sided test (i.e. no prior knowledge is assumed about the type of association).
Positive association This option will give a one-sided test of the null hypothesis that there is a positive association.
Negative association This option will give a one-sided test that there is a positive association.

Action Icons

Pin Controls whether to keep the dialog open when you click Run. When the pin is down  the dialog will remain open, otherwise when the pin is up  the dialog will close.
Restore Restore names into edit fields and default settings.
Clear Clear all fields and list boxes.
Help Open the Help topic for this dialog.

See also

Updated on April 26, 2019

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