Percent Difference – Percent Error
Percent Difference ? Percent Error
Sometimes scientists will want to compare their results with those of others, or with a theoretically derived prediction. Each of these types of comparisons call for a different type of analysis, percent difference and percent error respectively.
Percent Difference: Applied when comparing two experimental quantities, E1 and E2, neither
of which can be considered the "correct" value. The percent difference is the absolute value of the
difference over the mean times 100.
%
Difference
=
1 2
E1 - E2
(E1 + E2)
?100
Percent Error: Applied when comparing an experimental quantity, E, with a theoretical
quantity, T, which is considered the "correct" value. The percent error is the absolute value of the
difference divided bythe "correct" value times 100.
% Error = T - E ?100 T
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