Getting Started: VARIOGRAM Procedure

PROC VARIOGRAM uses your data to compute the empirical semivariogram. This computation refers to the steps you take to derive the empirical semivariance from the data, and then to produce the corresponding semivariogram plot.

You can proceed further with the semivariogram analysis if the data are free of systematic trends. In that case, you can use the empirical outcome to determine a theoretical semivariogram model by using automated or visual methods. The model characterizes the type of theoretical semivariance function you will use to describe spatial dependence in your data set.

Some of the following graphical displays are requested by using the ODS GRAPHICS statement. For general information about ODS Graphics, see Chapter 21, Statistical Graphics Using ODS. For specific information about the graphics available in the VARIOGRAM procedure, see the section ODS Graphics.