Discrepancy in Weighted Value Result

A formula for a weighted average using cols K and AN is giving me a result of 23.30% but the answer should be 7.44%, right, according to the long hand version I've written out below?


Am I using the correct formula to weight the col K, IV values with Vega in col AN?


Cheers,


K4 (12.05%) × AN4 (11.7642) = 0.1205 × 11.7642 = 1.4179

K6 (22.27%) × AN6 (-46.5696) = 0.2227 × (-46.5696) = -10.3703

K8 (12.45%) × AN8 (-51.8875) = 0.1245 × (-51.8875) = -6.4600

K10 (21.53%) × AN10 (47.5218) = 0.2153 × 47.5218 = 10.2367

K12 (7.60%) × AN12 (14.6174) = 0.0760 × 14.6174 = 1.1109

K14 (9.01%) × AN14 (-5.1448) = 0.0901 × (-5.1448) = -0.4635

K16 (9.65%) × AN16 (-3.1896) = 0.0965 × (-3.1896) = -0.3078

K18 (13.46%) × AN18 (42.2842) = 0.1346 × 42.2842 = 5.6917

K20 (19.13%) × AN20 (-39.0638) = 0.1913 × (-39.0638) = -7.4735

K22 (24.08%) × AN22 (-36.5901) = 0.2408 × (-36.5901) = -8.8118


Sum of Products = -4.93069361


Sum of AN values:


AN4 (11.7642) +

AN6 (-46.5696) +

AN8 (-51.8875) +

AN10 (47.5218) +

AN12 (14.6174) +

AN14 (-5.1448) +

AN16 (-3.1896) +

AN18 (42.2842) +

AN20 (-39.0638) +

AN22 (-36.5901) 


Sum of AN = -66.2577


= -4.9306 ÷ -66.258 = 0.0744 or 7.44%




[Edited by Moderator]



MacBook Pro 16″

Posted on Jul 31, 2025 02:56 PM

Reply
2 replies

Jul 31, 2025 08:31 PM in response to Bardonicloud

I think you added wrong. Using the numbers you provided, I get a SUMPRODUCT of -15.4348, not -4.9307. The sum of the values in AN is -66.2577. -15.438/-66.2577 = 0.23295 or 23.295%. The result is a little different from in your spreadsheet because the actual values in AN and/or K have more decimal places than is shown.


You should look at the SUMPRODUCT function. Your formula comes down to this:

=SUMPRODUCT(K4:K22,AN4:AN22)/SUM(AN4:AN22)

Which is the same as your much longer formula and gives you a "weighted average" of the percentages in K using the weights in AN

Discrepancy in Weighted Value Result

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