Question: *Show that in the model EY 0 1X1 2X2 3X1X2 the lines for the regression of Y on X1 at various

*Show that in the model EðYÞ ¼ β0 þ β1X1 þ β2X2 þ β3X1X2 the lines for the regression of Y on X1 at various fixed values of X2 all cross at a point (as in Figure 17.2 for Cowles and Davis’s logistic regression).

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