For questions about the data structures known as trees.

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Is there a way to combine VertexLabeling->True and VertexLabels/Tooltip in TreePlot?

Basically, I'm trying to make Mathematica give me a tree with names inside the rectangles like so: ...while also having the properties of VertexLabels or Tooltip, which lets me place my mouse over ...
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Creating Identification/Classification trees

I have data given in following format; from which I need to create identification/classification trees (three different trees from three different criterion, that is average disorder, gain ratio and ...
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Multi-named Nodes (or Overlapping Nodes) in TreePlot, or Merging Trees

If there is a series of rules from which a TreePlot is made: {D->C, C->B, B->A} And a new node is added that is technically the same as an existing ...