[問題] 迴歸的estimate的covariance???
如果fit the model as follows:
Y=a+b*X +c*Z +d*X*Z
Y is a continuous response
X is age
Z is an indicator taking value of either 0 or 1
a,b,c,d是estimates
要怎麼得到cov(b,d)呢?
我覺得這問題實在有點怪
但又確實需要這個quantity ><
有版友知道要怎麼做嗎?Thanks~~
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