September 19, 2021

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Re: “Roundoff”

Whether the times are truncated to the lower number of decimals or correctly
rounded makes no systematic difference when comparing results.  The
truncated values are on average exactly 0,5 part of the smallest digit value
smaller than the rounded values.  Both expand the smallest difference
between the input values into a full one unit of the smallest digit value in
the shortened number, but do so at different places in the continuum of
input values.

As long as you are only comparing results from the same data set, there will
be no systematic bias.  But if you compare truncated times with rounded
times, or compare totals of added times, there can be systematic bias.