Form Variogram

Form of the data

Allows you to specify the form of the data.

Data

Used to enter the data. If the form of the data is one-dimensional then the data should be in a variate. If the form is two-dimensional and in a regular grid the data should be supplied in a matrix, otherwise the data should be supplied in a variate.

The remaining fields to be filled in will depend on the form of the data.

One-Dimensional Data

Positions	The intervals or positions
Maximum	Maximum lag
Step Length	Length of each step in which lag is incremented

Two-Dimensional Regular Data

Y-Maximum	Maximum lag in the y direction
X-Maximum	Maximum lag in the x direction
Step Length	Length of each step in which lag is incremented

Two-Dimensional Irregular Data

Y-Positions	Y positions or interval
X-Positions	X positions or interval
X-Maximum	Maximum lag in the x direction
Step Length	A scalar specifying the length of each step in which lag is incremented or a variate containing each step
Directions	Directions (degrees) along which to form the variogram
Segments	Angles subtended by the segments (degrees) over which averaging is to be done

Method

Specifies the method to use when forming the variogram. By default the method of moments is used for estimating the variogram, however the alternative robust variogram estimators of Cressie and Hawkins, Dowd and Genton can be selected.

Action Buttons

Run	Run the analysis.
Cancel	Close the menu without further changes.
Options	Opens a dialog to specify additional options for displaying output and a plot of the variogram.
Defaults	Set the menu settings back to the default settings. Clicking the right mouse on this button produces a shortcut menu where you can choose to set the menu using the currently stored defaults or the GenStat default settings.
Store	Opens a dialog to specify names of structures to store the results from the tabulation. The names to save the structures should be supplied before running the tabulation.