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Cluster sampling examples. Example 1: Assume that a study with relatively large square fixed area plots of 50 m x 50 m had been carried out, on which all tree positions were mapped. Because the individual plots were relatively large, there were only resources available to measure \(n=10\) sample plots.
This example shows a simple scatter plot with grouped data that is clustered. proc sgplot data=sashelp.revhub2; scatter x=hub y=revenue / group=type groupdisplay=cluster clusterwidth=0.5; xaxis type=discrete; run; Create the scatter plot. In the SCATTER statement, the GROUP= option groups the data by the TYPE variable. The GROUPDISPLAY option specifies that the grouped markers are clustered. The CLUSTERWIDTH option specifies the width of the group clusters.