Consider loglinear model (WX, WY, WZ, XZ, YZ). Though X and Y are condi- tionally independent, explain
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Consider loglinear model (WX, WY, WZ, XZ, YZ). Though X and Y are condi- tionally independent, explain why they may be marginally dependent, collaps- ing over W and Z. Explain why the W-X and X-Z associations are unchanged when one collapses over Y, and the W-Y and Y-Z associations are unchanged when one collapses over X.
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