Re: On writing negative zero - with or without sign

Kevin G. Rhoads writes:

You might erroneously propagate the error using

dz**2 = dx**2 + dy**2

for the case

z = x + y

the error being due to the fact that x and y are anticorrelated. How is
interval arithmetic going to know that?

Actually that is the UNcorrelated case,

Incorrect. Uncorrelated means that the correlation coefficient is zero,
and changes in x are completely independent of changes in y. Anticorrelated
means that the correlation coefficient is -1, and that's the case for the
example I gave, because if you increase x by delta, you decrease y by delta.

for ANTIcorrelated you would use

dz = |dx - dy|

.

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