Park et al. (1996) describe a method for generating correlated binary variables based on the follow scheme.
Question:
YI = X1 + X3 and Y2 = X2 + X3.
(a) Show that Cov(yi,y2) = λ3.
(b) Define Zi = I(Yt = 0) and p, = e~(λi'+ λ3) Show that Zi are Bernoulli(pi) with
(c) Show that the correlation of Z1 and Z2 is not unrestricted in the range [-1,1],
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