WebDot products are distributive over addition: for vectors u, v and w (all either in 2-space or in 3-space), u • ( v + v) = u • v + u • w. Both of these rules are easy to check (use the … Web14 mei 2015 · J ( H − I) = 0 is another way to say J H = J. If for a vector of only ones, let's write it as 1, you get 1 H = 1 then it also works for J as well. This property 1 H = 1 is actually only true when the matrix X contains the vector 1 in it's column space, for instance when it contains an intercept term (but an intercept is not necessary).

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