Limit of p value from multcompare?

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Eric Zhang
Eric Zhang 2016-6-27
评论： the cyclist 2016-6-29
(I'm having exactly the same question as this one on Stack Exchange, so I'm quoting it verbatim as follows)
It seems to me that MATLAB multcompare cannot output any p value (for pairwise comparison) smaller than 9.56061674273201e-10.
To confirm this, I did
y = [ones(100,1) 2*ones(100,1) 3*ones(100,1)];
[p,tbl,stats] = anova1(y);
[c,~,~,gnames] = multcompare(stats);
p = c(:,6)
and got p values for the three pairwise comparisons
p =
9.56061674273201e-10
9.56061674273201e-10
9.56061674273201e-10
Why is there this limit in MATLAB? How should I report my p values then? It looks strange to report exactly same values for several different tests.
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Eric Zhang
Eric Zhang 2016-6-28
编辑：Eric Zhang 2016-6-28
@Brendan Hamm
Many thanks for the reply! Very interested in how exactly this rounding error occurs (or this limit is reached). Greatly appreciate it if you could elaborate more? Thanks a lot!

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