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Scaling of utility values: What is the formula for converting Raw Utilities to Zero-Centered Difference values

Dear Sawtooth Community,

in the Utility Report of Lighthouse’s Analysis Manager you have the option to display estimated part-worth utilities in “raw” and “zero-centered differences” format. What is surprising to me is that the ratios of utilities and even the order of attribute level values change depending on whether I display them in raw or scaled mode. Thus, it seems to me that it is not just a linear transformation.

Can you please indicate the formula that converts the values from "raw" to "zero-centered differences" and vice versa?

Thank you in advance and best regards,
Mike
asked Feb 14, 2017 by summand (385 points)
retagged Feb 14, 2017 by Walter Williams

1 Answer

+1 vote
Please see a previous post that covers this.  Thanks for asking about it!

https://sawtoothsoftware.com/forum/6140/is-there-a-formula-for-calculating-the-zero-centered-diffs

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answered Feb 14, 2017 by Bryan Orme Platinum Sawtooth Software, Inc. (131,990 points)
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