Hi everyone,
I would like to conduct a CVA (instead of a CBC) with single rating tasks given the fact that my sample size is severly limited (N=17). I only have to attributes: (i) quantity and (ii) price, with four levels each. More specifically:
Attribute 1 (quantity):
------------------------------
0x (none-option)
1x
2x
3x
Attribute 2 (price):
------------------------------
-100% (none-option)
-30% (low)
0% (mid)
+30% (high)
I would like to know respondents' WTP for differing quantities of the good, keeping in mind that respondents can also pick zero quantities, for which, of course, they pay nothing (=none-option).
Now I wonder how to implement this design in the "most efficient" way (whatever this means). For example, I thought of four levels for the attribute "quantity" (0x, 1x, 2x, 3x), but only three levels for the attribute "price" (-30%, 0%, +30%) and to use conditional pricing. In the conditional pricing settings, I then set the price for "0x" always to zero, independent of the price attribute. However, in the market simulator and its conditional pricing table, I have to set an ascending or descending order for the different price levels of "0x". Is it appropriate to only use marginal increments, such as "0.01$", "0.02$", and "0.03$" for "0x", while for all other quantity <> price combinations, I have realistic values, for example, "7$", "10$", and "13$"?
How would you proceed with my setting?
Thanks in advance for your help!