Definition of attribute levels

Question

Dear all,

is there any issue with using numeric AND nominal levels in the same attribute.
e.g.
Attr. 1: 200€, 400€, 600€, unlimited
Attr. 2: 2 months, 4 months, unlimited
Attr. 3 (Price): 5%, 10%, 15%

Especially, I was wondering if this makes it comlicated to estimate the WTP?

Thanks in advance!

Answer 1

Yes, there is - you're going to find it impossible to interpolate between the top quantified level and the unbounded one.  And it will complicate the interpolations between quantified levels, too.  And yes, it may well complicate your WTP estimation.