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Feb 22, 2018 at 14:51 comment added whuber @Heisenberg I am grateful for your perceptive observation: it enabled me to correct a substantial error in the discussion of the multiple regression case.
Feb 22, 2018 at 14:50 history edited whuber CC BY-SA 3.0
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Feb 21, 2018 at 23:07 comment added whuber @Heisenberg That's a good point. I was unclear about this. There's no ambiguity in the case of two columns, but I need to think how to improve the presentation for the case of more columns.
Feb 21, 2018 at 22:47 comment added Heisenberg The answer says "[...] off-diagonal elements, which are just the dot products of the two columns of X." This is true for $X'X$, not $(X'X)^{-1}$ however?
Jun 25, 2014 at 18:30 vote accept arnab
Jun 25, 2014 at 14:43 history answered whuber CC BY-SA 3.0