Dear Ngene experts:

I am relatively new to Ngene. In the design of DCE, I encountered some questions. I want to find the answers in the forum. If I can get your help, I would appreciate it very much.

This is my syntax:

Design

;alts=alt1*,alt2*,alt3

;rows=6

;eff=(mnl,d)

;model:

U(alt1)=b1.effects[0.0000001]*A[0,1]+b2.effects[-0.0000001|-0.0000002]*B[0,1,2]+ b3.effects[0.0000001|0.0000002]*C[0,1,2]+b4.effects[0.0000001|0.0000002]*D[0,1,2]+ b5.effects[0.0000001|0.0000002]*E[0,1,2]/

U(alt2)=b1*A+b2*B+b3*C+b4*D+b5*E/

U(alt3)=b0[0]

$

And my questions is :

1 As shown above, I use effect coding, but after collecting the data, I will calculate WTP. And my question is whether the choice of dummy coding or effect coding will have an impact on the final calculation of WTP? And what should I pay attention to when using effect coding to calculate WTP?

2 I have doubts about the minimum number of rows. I know that it should satisfy the attribute level balance. So in my syntax, is “rows=6” feasible?

3 And “U(alt3) =b0[0]”, Is it feasible to set the b0 to 0?

If my question seems very ignorant, please forgive me. Thank you again for your help.