We are doing a brand - price study where I have 20 brands and another attribute of price with levels p1 - p5.
We are showing price using conditional formatting. My concern is that price is not equally spread, levels of brands are -20% -10% 0% 10% 20%, some are -18%, -15%, 0, 13% 15%, some are -25% -10% 0% 15% 20% etc
Do you foresee any problem in utilities computation due to this irregularity? Would you prefer to setup the study such that there are 20 attributes with 5 levels each - alternate specific approach?