Is X d-Separated from Y by Z?:
Applet developed by
Frank Wimberly. Send comments to
INSTRUCTIONS Click on "Add Vertices". Then select vertex locations with the mouse.
Click on "Add Edges". Then drag the mouse from one vertex to another to add an edge between
When you are satisfied with the graph click the "Store Graph" button.
Click on the "Select X" button and then click on a vertex in the graph you have drawn.
It will change color. Do the same to select the second vertex with "Select Y".
To identify the conditioning set: click on the "Add to cond set" button and then click
on the vertices you like. X and Y cannot be in the conditioning set. Similarly for
"Del from cond set".
Click on the "X d-Sep Y?" button to ask whether the X and Y vertices you
selected are d-separated given the conditioning set you selected and the graph you have
drawn. The answer will be displayed below the graph.
Below you see a region with a number of buttons at the top. This
region contains a Java applet for entering a digraph and testing
d-separation questions. After you read the instructions scroll down to the point where the
buttons are at the top of the screen. To use the applet do the following:
Note: If you would like to enter a new graph, including vertices and
edges, merely push the "reload" button on your browser.