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How is the transformation from (1,2,6) to (-3,2,3) calculated here?

Shouldn't the centered value be (6-1)/2=2.5, so the rescaled values would be (-1.5,-0.5,2.5)?

I am trying to figure out how to calculate the center to re-scale prices for modelling.  I cannot seem to find a consistent answer.
related to an answer for: linear price calculations
asked Jan 12, 2017 by anonymous

1 Answer

0 votes
No, I think it's just a typo.   The original values 1,2,6 sum to 9 and their average is 3.  Subtracting 3 from 1, 2 and 6, respectively, yields -2, -1 and 3, which are zero centered.
answered Jan 13, 2017 by Keith Chrzan Platinum Sawtooth Software, Inc. (104,650 points)