Question: 7. Let us say we have two variables x1 and x2 and we want to make a quadratic fit using them, namely, f (x1, x2)
7. Let us say we have two variables x1 and x2 and we want to make a quadratic fit using them, namely, f (x1, x2) = w0 + w1x1 + w2x2 + w3x1x2 + w4(x1)2 + w5(x2)2 How can we find wi, i = 0, . . . , 5, given a sample of X ={xt 1, xt 2, rt}?
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