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7.7 The Tree Menu

This is what the submenus of the Tree menu do:

Menu Choice	Does This
Options	Opens a two tabbed dialog that allows you to change calculation and display parameters.
Subset Spreadsheet	Creates a new spreadsheet view of any node highlighted with Shift+Click or Search Tree
Subset Tree	Creates a new tree view of any node highlighted with Shift+Click or Search Tree
Extend Current Tree Randomly	Opens a dialog that allows you to create multiple trees using random values.
Search Tree	Opens a submenu with various methods of highlighting nodes of the tree.

Figure 7.46:

The Tree drop down menu options.

The Tree menu allows you to create subsets of your current tree and to create randomly created groups of trees.

7.7.1 Tree->Options

The menu choices under Tree->Options is covered in Chapter 3.5.3.1.

7.7.2 Tree->Subset Spreadsheet

Figure 7.47:

A tree view with a node highlighted for subsequent subset spreadsheet selection.

You can select any node by using Shift+Click or using the Search Tree submenu. It will indicate selection by showing a pink border around the node. Once selected, the menus Tree->Subset Spreadsheet will open a new spreadsheet ﬁlled with the records in that node.

Figure 7.48:

A spreadsheet showing the contents of a node.

This spreadsheet will hold only the patients over age 50 indicated by a previously selected node.

7.7.3 Tree->Subset Tree

Figure 7.49:

A tree showing only the subset node

Using the same selected node we can use the menus Tree->Subset Tree to create a new tree view with the selected node as the parent node. You can now do analysis on the subset of the original data set.

Multiple interesting nodes in a tree can be selected by Shift Clicking on them, and then performing a tree analysis only on a merged subset of the observations that belong to the selected nodes. This menu selection will cause a new tree analysis window to be displayed with a root node corresponding to the observations from all previously selected (magenta-bordered) nodes.

Figure 7.50:

A tree with interesting side nodes

In Fig. 7.50 we see that the center node has a higher mean that the two side nodes. We can shift click on each of the two side nodes and then select the menus Tree->Subset Tree.

Figure 7.51:

This node combines the two outside nodes in the above tree view.

This gives a new tree view that allows us to explore the details of these lower mean nodes. Because these two nodes have an almost equal mean, it might make sense to combine them to obtain a larger sample size, rather than analyzing them separately.

7.7.4 Tree->Extend Current Tree Randomly

Creating random trees (or multiple trees as it is sometimes referred to) is covered in detail in the following Chapter 9, Random Tree Generation.

7.7.5 Tree->Search Tree

Figure 7.52:

The Search Tree submenu listing various search capabilities.

If you want a more dynamic method of searching, you can highlight nodes for the purpose of using Tree->Subset Tree and Tree->Subset Spreadsheet, or if you simply want to ﬁnd a single node in a large tree, the Search Tree submenu can help you.

The Search Tree submenu highlights nodes in the same fashion as Shift-Click, allowing them to be selected by the Subset Spreadsheet and Subset Tree submenus of the Tree menu. See Section 7.7.5 for more information. This is what the ﬁve items of the Search Tree menu do:

Menu Choice	Does This
Find Observation	Opens a dialog with options for searching through a tree for observation names.
Find Node	Opens a dialog with options for searching for the labels assigned to tree nodes. i.e.N112
Select Node by Threshold	Opens a dialog with options for searching for nodes with a mean above or below a threshold
Highlight All Nodes	Highlights all the nodes in a tree.
UnHighlight All Nodes	UnHighlights all the nodes in a tree.

The menus Tree->Subset Tree and Tree->Subset Spreadsheet perform operations only on the nodes highlighted by Shift-Clicking or using the search methods of this sub-menu. You can now search large trees for nodes of signiﬁcance with Select Node by Threshold or ﬁnd where in a tree an observation lies with Find Observation.

7.7.5.1 Tree->SearchTree->Find Observation

Figure 7.53:

This dialog allows you to quickly ﬁnd nodes in a tree.

You can use the SearchTree->Find Observation to ﬁnd where an observation lies in a tree, highlight that node, or the entire path to that node or search for all observations that contain a speciﬁc string in their name.

There are three options you can change:

Value Labeled	Explanation
Highlight	When Leaves Only is selected, the search will only highlight the leaf node or nodes matching the search criteria. Otherwise when Entire Path is selected, all nodes matching the search will be highlighted
Search Method	Speciﬁes whether the search will ﬁnd only exact matches of the search string or will include all observations with labels that contain the search string.
Select Method	The Add to Lookup method will leave the current highlighted nodes on the tree, while the Replace Lookup will unhighlight the entire tree before highlighting any found nodes.

7.7.5.2 Tree->SearchTree->Find Node

Figure 7.54:

This command helps you zero in on a particular node.

If you would like to highlight a node with a speciﬁc node name, or highlight a node and its subtree, you can use the SearchTree->Find Node dialog.

There are two options you can change:

Value Labeled	Explanation
Search Method	Speciﬁes whether the search will ﬁnd only exact matches of the search string or will include all observations with labels that contain the search string.
Select Method	The Add to Lookup method will leave the current highlighted nodes on the tree, while the Replace Lookup will unhighlight the entire tree before highlighting any found nodes.

Figure 7.55:

This selection highlights nodes by their threshold value.

7.7.5.3 Tree->SearchTree->Select Node by Threshold

If you would like to highlight only the nodes with a high or low mean response, you can use the SearchTree->Find Node by Threshold dialog.

There are two options you can change:

Value Labeled	Explanation
Search	When Leaves Only is selected, the search will only highlight the leaf node or nodes matching the search criteria. Otherwise when All Nodes is selected, any node matching the search will be highlighted
Select Method	The Add to Lookup method will leave the current highlighted nodes on the tree, while the Replace Lookup will unhighlight the entire tree before highlighting any found nodes.

Figure 7.56:

Using Select Node by Threshold gives a quick visual reference as to which nodes have high mean values.

7.7.5.4 Tree->SearchTree->Highlight All Nodes

These menu items allow a fast way to highlight all the nodes

7.7.5.5 Tree->SearchTree->UnHighlight All Nodes

These menu items allow a fast way to unhighlight all the nodes

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