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The VARIOGRAM Procedure

Displayed Output

In addition to the output data sets, the VARIOGRAM procedure produces several output objects. Most of those are produced depending on whether you specify either NOVARIOGRAM or LAGDISTANCE= and MAXLAGS= in the COMPUTE statement. The VARIOGRAM procedure output objects are the following:

  • a default "Number of Observations" table that displays the number of observations read from the input data set and the number of observations used in the analysis

  • a default map showing the spatial distribution of the observations of the current variable in the VAR statement. The observations are displayed by default with circled markers whose color indicates the VAR value at the corresponding location.

  • a table with basic information about the lags and the extreme distance between data pairs, when NOVARIOGRAM is specified

  • a table that describes the distribution of data pairs in distance intervals, when NOVARIOGRAM is specified

  • a histogram plot of the pairwise distance distribution, when NOVARIOGRAM is specified). The plot also displays a reference line at a user-specified pairs frequency threshold when you specify the THRESHOLD= parameter in the PLOT=PAIRS option. The option PLOT=PAIRS(NOINSET) forces the informational inset that appears in the plot to hide.

  • empirical semivariogram details, when NOVARIOGRAM is not specified and LAGDISTANCE= and MAXLAGS= are specified. This table also includes the semivariance estimate variance and confidence limits when CL is specified, and estimates of the robust semivariance when ROBUST is specified.

  • plots of the appropriate empirical semivariograms, when NOVARIOGRAM is not specified and LAGDISTANCE= and MAXLAGS= are specified. If you perform the analysis in more than one direction simultaneously, the output is a panel comprising the empirical semivariogram plots for the specified angles. If the semivariograms are nonpaneled, then each plot includes in the lower part a needle plot of the contributing pairs distribution.

  • a table that provides autocorrelation statistics, when the options AUTOCORRELATION and LAGDISTANCE= are specified

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