Question: Consider model (WX, YZ). Applying the collapsibility conditions in Section 7.1.4 with sets A {W.X), C (Y,Z), and with B empty, explain why the W-X

Consider model (WX, YZ). Applying the collapsibility conditions in Section 7.1.4 with sets A {W.X), C (Y,Z), and with B empty, explain why the W-X partial association is the same as the W-X marginal association, collapsed over Y and Z.

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