Question: Show that the first-order conditions for (2.1) are which is equivalent to equation (2.4). Thus, calculus provides another way to construct the orthogo- nality conditions.
Show that the first-order conditions for (2.1) are

which is equivalent to equation (2.4). Thus, calculus provides another way to construct the orthogo- nality conditions. (HINT: You may find the summary of matrix differentiation in Appendix G helpful.) *
a (y-X8)' (y-X8) -2. = 2 x ( y ) = 0 =0
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