Hi Ngene members,
I'm trying to design an experiment about the economic valuation of an ex - ante implementation of a sustainable urban drainage system (SUDS). My experiment has three attributes (Reduction in the average number of fatalities because of the flash floods, and vehicular and pedestrian mobility), 6 price levels, two alternatives and the status quo, as follows:
Average number of fatalities per 10 years: [20], 10, 0
Vehicular mobility: [Null], Reduced, Normal
Pedestrian mobility: [Null], Reduced, Normal
Fee: [0], 1, 2, 8, 15, 23
If the SUDS is implemented, the number of "fatalities" should be reduced, and that means that the price that the people would pay for the system implementation should increase as well. Consequently, I must add to my design some restrictions that indicate, for example, that the attribute "Fatalities” is always decreasing, i.e., it goes from 20 to 10 and from 10 to 0; that the attributes of mobility must shift from Null to Reduced and from Reduced to Normal; and that the fees for financing the implementation are always increasing from alternative 1 to alternative 2.
With that information, I tested the following syntax,
Design
; alts = A, B, SQ
; rows = 96
; block = 2
; eff = (mnl, d)
; cond:
if (A.att1 = 10, B.att1 < A.att1),
if (A.att1 = 10 and A.att2 = 2, B.att2 < A.att2),
if (A.att1 = 10 and A.att2 = 2 and A.att3 = 5, B.att3 < A.att3),
if (A.att1 = 10 and A.att2 = 2 and A.att3 = 5 and A.att4 = [1,2,8,15,23], B.att4 > A.att4)
; model:
U(A) = A0[-0.2] + A1[0.2]*att1[0, 10] + A2*att2[1, 2] + A3[-0.3]*att3[4, 5] + A4[-0.4]*att4[1,2,8,15,23]/
U(B) = B0 + B1*att1 + B2*att2 + B3*att3 + B4*att4$
The syntax runs well. Even a 0.07 D-error is obtained. However, I'm not sure of this syntax as I had to increase the number of rows, and the number of scenarios that meets the aforementioned design requirements reaches only 10 out of 96 possible scenarios.
I’d appreciate if someone send me a feedback about my experiment to see whether I'm right or not on this design.
Juan