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ACA average utilities

If I take average of the utility scores from the OLS data,
They dont match the average utilities scores provided in the ACA OLS Summary Results.
How are these calculated? & how the importance scores are calculated for ACA?
asked Apr 3, 2012 by mal_saw2001 Bronze (875 points)

1 Answer

0 votes
The utilities displayed in the summary are rescaled to "zero-centered Diffs".  The utilities are zero-centered within attributes for tabulation to you, and the size of the utilities is expanded using a multiplier such that the average difference between best and worst levels within an attribute (within a respondent) is 100.  You can see a description of that rescaling at:


We do this rescaling so that each respondent gets approximately the same weight in the averages.  Otherwise, some respondents (who have larger magnitude of scaling in ACA, due to their answers in the Calibration Concepts) will get too much weight.
answered Apr 3, 2012 by Bryan Orme Platinum Sawtooth Software, Inc. (134,015 points)