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Interpolation Error<br />
$$<br />
BCWS C<br />
BCWP<br />
May<br />
EVA-11<br />
Jun 12-17, 17, 2006<br />
BCWS C+1<br />
•<br />
F<br />
I<br />
• •<br />
δ<br />
June<br />
Time<br />
•<br />
ES(calc)<br />
error<br />
ES<br />
(C) (C + 1)<br />
July<br />
ES = Number of whole months (C) +<br />
Increment on curve (F)<br />
= C + F<br />
ES(calc) = C + calculated<br />
increment (I)<br />
Error (δ)(<br />
) = I - F<br />
% error =<br />
| δ |<br />
C + F<br />
Example = .05 / 8.12 = 0.6%<br />
As C ⇒ larger<br />
- % error ⇒ smaller<br />
- ES(calc) ⇒ more accurate<br />
Weekly EV make ES more accurate<br />
Copyright 2006<br />
Lipke & Henderson 46
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