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May 1, 2018 at 1:44 comment added Iosif Pinelis I also had this feeling, before and especially after your answer, that sometimes a few $0$'s are better than none.
Apr 30, 2018 at 22:22 comment added Aaron Meyerowitz Yes, exactly. In general I’d think fewer 0’s is better (but sometimes some turns out better than none!) and all things treated the same is desirable.
Apr 30, 2018 at 12:39 comment added Iosif Pinelis Very good and complete answer; I need education in experimental design. My only question at this point: Does $J$ denote the matrix of $1$'s?
Apr 30, 2018 at 12:37 vote accept Iosif Pinelis
Apr 30, 2018 at 9:47 history edited Aaron Meyerowitz CC BY-SA 3.0
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Apr 30, 2018 at 8:53 history edited Aaron Meyerowitz CC BY-SA 3.0
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Apr 30, 2018 at 8:44 history answered Aaron Meyerowitz CC BY-SA 3.0