I started using Ngene last week. I would like to clarify certain doubts, and I apologize if the questions are simple.

I am developing a model for mode choice (2 labeled alternatives), with 3 attributes. As I have no previous studies in my country, I will carry out a pilot study. Can I include low values (-0.001 and +0.001) for all prior values?

In the case of the constant (bo), what procedure can I adopt about prior values and the sign if I have no information for the pilot study?

- Code: Select all
`design`

;alts = 1,2

;rows =8

;eff = (mnl,d)

;cond:

if (2.B2 = 6, 2.C2 <> 25)

;model:

U(1) = b0[0.001] + b1[0.001] * A1[0,1]+ b2[-0.001]* B1[5] + b3[-0.001] * C1[25,35] /

U(2) = b2 * B2[6,10] + b3 * C2[15,25]

$

Thank you for the attention.

Regards,

Felipe Souza