交互项的意义如何解释？
y=a*x1+b*x2+c*(x1*x2)
what is the mean for c?
we can say that a and b is the x1 and x2 increasing for 1 unit, the affect for y,
then c?
c=[x1(1)*&2(1)-x1(1)&x2(0)]-[x1(0)&x2(1)-x1(0)&x2(0)]
how to say?
这样，该模型下面的那段话中，第二句话才能与模型对应上：“我们很容易看出，现在x2的系数，便是在x1的均值处x2对y的偏效应。”（英文原文（4th，p197）是：We can easily see that now the coefficient on x2, δ2, is the partial effect of x2 on y at the mean value of x1. ）
扫码加好友，拉您进群
全部版块
我的主页
收藏
