Referendum-style Design

[jamalm]

Dear Ngene Community,

I’m designing a pilot survey for a referendum-style DCE (i.e., Yes, I vote vs. No, I won't vote). The good in question is a public policy. Below is the Ngene syntax I currently have. It runs fine. My main question is whether I am designing the choice set correctly by including two alternatives: one for the policy and an opt-out. Below are my codes:

Code: Select all

Design  
  ;alts = Policy*, OptOut* 
  ;rows = 24  
  ;block = 2,minsum 
  ;eff = (mnl, d) 

 ? ;alg = mfederov ?(candidates=100)
 ?;con

;cond:
     ? Ensure Cost does not equal to $0 if infrastructure is added  
    if (Policy.FuelCorridor = 1 or Policy.NewH2 = 1 or Policy.FormicAcid = 1, Policy.Cost <> 0)  
 
;model:    
  U(Policy) =  
      b1.dummy[0.02|0.03|.04] * Emissions[10,15,20,5]  ? 5% (base), 10%, 15%, 20%  
    + b2.dummy[-0.02|-0.03|-.04] * JobsLost[52800,79200,105600,26400]  
    + b2.dummy[0.02|0.03|.04] * JobsGained[100000,150000,200000,50000]  
    + b4[0.1]        * FuelCorridor[1,0]          ? 0 = No (base), 1 = Yes  
    + b5[0.1]        * NewH2[1,0]                 ? 0 = No (base), 1 = Yes  
    + b6[0.1]        * FormicAcid[1,0]            ? 0 = No (base), 1 = Yes  
    + b7[-0.01]      * Cost[0,5,10,20,30,50]      ? 0 = NO CHANGE (base)  

$


Thank you,
Jamal

[Michiel Bliemer]

Yes that looks okay, except for two things:
1. You should remove the asterisk (*) in the alts property since these are labelled alternatives.You should only include an asterisk for unlabelled (generic) alternatives.
2. You need a constant, so either add b0[0] in U(policy) or specify U(optout) = b0[0].

Michiel

[jamalm]

Thank you, as always, for your prompt and helpful response, Michiel!
—Jamal