choice-metrics.com

Hi,
This question is related with web survey. Thinking about two strategies in letting respondent only seeing part of the design so that they do not feel fatigue: block, and random allocation.
Block means to split the design into several versions of questionnaire. Random allocation is a different ...

Hi
I have a question about the number of choice tasks (number of rows) needed in estimating mixed logit models, latent class models etc.

I learn from Ngene manual and this forum that when talking about the number of choice tasks, it should be at minimum S, where S*(J-1)>=K. In our study, the J =3 ...

Dear Michiel, Thanks a lot!
I add some more constraints on the code you suggested and it is working as what I want.

Design
;alts = alt1, alt2,alt3
;rows = 24
;eff=(mnl,d)
;block=3
;alg = mfederov(candidates = 1000)
;reject:
alt1.type = 1 and alt1.sick = 50,
alt1.type = 1 and alt1.sick = 100,
alt1 ...

I have a question about how to keep one "necessary" attribute level balance feature for one specific attribute in a constrained design.

As you can see in the first code, I try to make sure when illness type=1 , sick= 0
In the design generated, type=1 only appear very limited times, much fewer than ...