Search found 16 matches

by greenvanilla
Sun May 24, 2020 5:26 pm
Forum: General questions about choice experiments
Topic: Mean-centering and opt-out option
Replies: 3
Views: 8606

Re: Mean-centering and opt-out option

Dear Michiel,

Thanks a lot for clarification!

With respect to the opt-out option, I meant that I created a variable as an alternative-specific constant for the opt-out option instead of using alternative-specific constants for the product options. Meaning that this effects-coded opt-out variable ...
by greenvanilla
Fri May 15, 2020 11:04 pm
Forum: General questions about choice experiments
Topic: Moderating attribute
Replies: 2
Views: 5801

Re: Moderating attribute

For the analysis I would suggest to create interaction variables involving the potential moderator variable.
The four variable model would not tell you much about the moderating influence of this variable without interactions.
You could specify interactions already in Ngene, but I think it is not ...
by greenvanilla
Fri May 15, 2020 4:31 am
Forum: General questions about choice experiments
Topic: Mean-centering and opt-out option
Replies: 3
Views: 8606

Mean-centering and opt-out option

Dear all,

this is rather an analysis question than a choice design question, but as it is quite choice experiment-specific, maybe you could help me nevertheless?

I would like to use effects coding for my variables as I would like to avoid confounding with the opt-out option which I specified as ...
by greenvanilla
Tue Dec 03, 2019 6:41 pm
Forum: General questions about choice experiments
Topic: Questions to (pilot study) choice design
Replies: 15
Views: 22968

Re: Questions to (pilot study) choice design

Thank you very much!
I will read the paper you are referring to!
by greenvanilla
Tue Dec 03, 2019 12:15 am
Forum: General questions about choice experiments
Topic: Questions to (pilot study) choice design
Replies: 15
Views: 22968

Re: Questions to (pilot study) choice design

Thank you for the explanation! :)

So if I understood you correctly, you would just use the MNL design that resulted from the Ngene code presented above and report the D-error from the MNL design,
and later still estimate a panel mixed logit model (I am planning to estimate a latent class model ...
by greenvanilla
Fri Nov 29, 2019 7:03 pm
Forum: General questions about choice experiments
Topic: Questions to (pilot study) choice design
Replies: 15
Views: 22968

Re: Questions to (pilot study) choice design

Thank you very much!

I have now tried to use the parameter estimates and the (non-adjusted) standard errors from the pilot study as priors and standard deviation for the model.
Following advice provided in the Ngene manual (p. 108), I tried to specificy the model as a random parameter model in the ...
by greenvanilla
Tue Nov 19, 2019 6:36 pm
Forum: General questions about choice experiments
Topic: Questions to (pilot study) choice design
Replies: 15
Views: 22968

Re: Questions to (pilot study) choice design

Thank you for your reply!

But now I am a bit confused. :)
In the pilot study I used a conditional logit (MNL) model, but the data has panel structure (several choice sets for each respondent).
But finally I am planning to generate a Bayesian efficient design for an rppanel model.
As I understood ...
by greenvanilla
Sun Nov 17, 2019 7:58 pm
Forum: General questions about choice experiments
Topic: Questions to (pilot study) choice design
Replies: 15
Views: 22968

Re: Questions to (pilot study) choice design

Thank you for your reply!

Yes, I meant accounting for panel effects, as you explained it.
For some reason I haven't figured out how to do this for clogit in Nlogit, but I will try to ask the Nlogit forum.

But is it correct to use these panel-adjusted standard errors than for input into Ngene for ...
by greenvanilla
Fri Nov 15, 2019 1:08 am
Forum: General questions about choice experiments
Topic: Questions to (pilot study) choice design
Replies: 15
Views: 22968

Re: Questions to (pilot study) choice design

Dear Prof. Bliemer and all,

I have implemented the pilot study now and am now concerned with the analysis of the data obtained.
I have some prior experience with Stata used for choice analysis, but my colleagues rather use Nlogit, so I am thinking about whether it makes sense to learn Nlogit or ...
by greenvanilla
Mon Nov 04, 2019 8:55 pm
Forum: General questions about choice experiments
Topic: OOD: Who coined the term?
Replies: 2
Views: 5632

Re: OOD: Who coined the term?

Thank you so much for your prompt reply! :-)