# WTP computation and coding

Dear all,

my price attribute (A1) solely has quantitative levels. The other two attributes (A2; A3) have one qualitative level and three quantitative levels each. Supposing that I dummy code all three attributes:
- Is it possible to tell how much people are willing to pay for e.g. level 1 of A2?
- Is it possible to answer the question how much more people are willing to pay for a shift from level one to level two of A2 or A3?
- Is it possible to interpolate between the levels of my attributes even if they are dummy coded or would that only be possible if I code at least the price attribute linear (trying to answer the question how much more people are willing to pay for one unit more of A2?)
- Does dummy coding of all attributes allow to answer the question how much more probable it is that an alternative is choosen if the price raises by 1% (or does at least the price need to be linear coded for this computation)?
- Generally: an attribute that contains quantiative and qualitative levels always needs to be dummy/effects coded, right?