Local Selection
Local Selection Mode is a new graphical data analysis technique developed at SAS Institute. IML Workshop Version 2.0 is the first product to implement Local Selection Mode. In Local Selection Mode, each data view has a private observation selection state. Local Selection Mode enables you to graphically subset data at multiple levels. For example, in a situation where there are four plots called A, B, C, and D, Local Selection Mode enables you to configure plot D to display either the union or the intersection of the selections made in plots A, B, and C.
While in Local Selection Mode, a data view operates in one of two roles: as a Selector view, or as an Observer view.
A Selector view allows you to manually select observations. When you select an observation in a Selector view, the observation is marked as selected only for that view. A Selector view treats an observation as selected only if you selected the observation in that view. In the example situation, plots A, B, and C are Selector views.
An Observer view does not allow you to manually select observations. An Observer view treats an observation as selected based on the observation's selection state in the Selector views and on the Observer view's scheme. There are two Observer view schemes: Union, and Intersection. The Union scheme treats an observation as selected if the observation is selected in any of the Selector views. The Intersection scheme treats an observation as selected if the observation is selected in all of the Selector views. In the example situation, plot D is an Observer view in the Intersection scheme.
Local Selection: The upper-right scatter plot is an Observer view displaying the intersection of three Selector
views.
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