Gamma Statistic

Select menu: Stats | Statistical Tests | Gamma Statistic

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

After you have imported your data, from the menu select
Stats | Statistical Tests | Gamma Statistic.
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 i^th level of variable A occurs with the j^th 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.

Data

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.

Method

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.