I am running a CBC/HB study and I've got the following average utilities from averaging the individual utilities in the .HBU file:
Attribute 1: 5,94 0,65 -6,59
Attribute 2: 4,42 -0,44 -3,98
None option: 11,55
However, when I run SMRT (using HB estimation) I get the following average utilities:
Attribute 1: 60,13 1,43 -61,55
Attribute 2: 42,90 -7,48 -35,42
None option: -218,06
The point is: how do I get such a different utility for the none option? (it never happened before!). As you can see, if I rank the concepts, In the first case the None has the highest utility (11,55 > 5,94 + 4,42) but in the second it has the lowest of all possible combinations.
The transformation that SMRT makes (I always thought it multiplied by a constant), would give the same relative positions, right...?
In this particular study the None option is critical...
Thank you in advance