## Choice experiment design and analysis of pure scenario CE

This forum is for posts that specifically focus on Ngene.

Moderators: Andrew Collins, Michiel Bliemer, johnr

### Choice experiment design and analysis of pure scenario CE

Dear Michiel,

I am conducting a choice experiment where respondents are provided with a future scenario and have to decide whether they want to relocate away or stay in their neighborhood under the scenario.

As this is a pure scenario CE it is quite peculiar and I just want to be sure that I have applied the design correctly in NGENE. I have generated a bayesian efficient design based on priors from a pilot study MNL:

design
;alts = relocate, stay
;rows = 24
;block = 3
;eff = (mnl,d,mean)
;model:
U(relocate) = asc_r [(n,-0.18119,0.25367)]
+ flood_r[(n,-0.01774,0.00366)] * FLOOD[5,10,20,50,100]
+ beach_r[(n,-0.00507,0.00338)] * BEACH[0,-25,-50,-75,-100]
+ economy_r[(n,-0.00949,0.00420)] * ECONOMY[-40,-20,0,20,40]
+ insurance_r[(n,0.00857,0.00180)] * INSURANCE[0,10,25,50,100,200]
\$

Is this design appropriate?
Also, I now use 24 rows and 3 blocks. Where should I base the decision on number of rows/blocks on (all respondents will receive 8 cards).

I also was wondering if I can just use an MNL regression even though I have just two choice alternatives (relocate or stay)? Does an MNL automatically take into account the binary nature of the choices?

Best regards,
Sem
semduyn

Posts: 4
Joined: Thu Mar 31, 2022 1:48 am

### Re: Choice experiment design and analysis of pure scenario C

Yes that model and syntax looks good. For another example of a pure scenario choice experiment, see this publication:

De Bekker-Grob, E.W., A.D. Bergstra, M.C.J. Bliemer, I.J.M. Trijssenaar-Buhre, A. Burdorf (2015) Protective behaviour of citizens to transport accidents involving hazardous materials: a discrete choice experiment applied to populated areas nearby waterways. PLoS ONE, Vol. 10, Issue 11, pp. 1-14.

Your choice of rows and blocks is fine.

If you want attribute level balance, you could choose 30 rows (you have attributes with 5 and 6 levels) and block the design in 3.

MNL is appropriate for any number of alternatives, including 2 alternatives (binary choice), it works the same.

Michiel
Michiel Bliemer

Posts: 1641
Joined: Tue Mar 31, 2009 4:13 pm

### Re: Choice experiment design and analysis of pure scenario C

Dear Michiel,

Good to know that I am on the right track.

All the best,
Sem
semduyn

Posts: 4
Joined: Thu Mar 31, 2022 1:48 am