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Dear Professor Bliemer,

I estimated the MNL model for the generic coefficients as you indicated in the last post.

All coefficients were significant with the exception of comfort. In Ngene, I developed the design with the syntax below.

design
;alts = TP,RD
;rows =12
;block =2
;eff = (mnl,d,mean ...

Dear Professor Bliemer,

Thank you for your answer. We adopted a small pilot study avoiding prior values from literature.

One last doubt regarding the design generated with this syntax was the high number of S estimate.

Is the high value of the S estimate a problem for the final design? Could ...

Dear Professor Bliemer,

I would like to ask questions for the development of the research after a pilot study.

A pilot study was carried out in order to obtain prior values.

The significant parameters were only those related to Confort_TP and Cost_TP.
All parameters had the correct (expected ...

Dear Professor Bliemer,

Thank you very much for your answers. I apologize for the excess of questions. I would like to clarify some doubts.

In the case of a final questionnaire developed from a design with zero priors approach, what are the implications for the research? Could this be a reason for ...

Dear Professor Bliemer,

Thanks for the information.

For to the final questionnaire (without carrying out a pilot study), do you recommend using low value sign (-0.001 or + 0.001) if I know the sign of each factor?

In Factor B, there are three levels. I am using a pivot design. The central value ...

Dear Professor Bliemer,
Thanks for your response. I had already read your article suggested in the last post. However, I don't think I have the capacity to judge the prior values.
Due to the sample restrictions for conducting a pilot study which procedure do you suggest to develop the final ...

Dear Professor Bliemer,

Thank you for your answer.

Research with companies is difficult due to the restrictions they have in answering questionnaires. Thus, a pilot study would already be difficult to apply due to the sample restrictions. My model has 6 attributes. 2 attributes are specific to my ...

Dear Ngene team,

I will start a SP study in the freight transport sector. I aim to have a sample of up to 50 companies. I would like to clarify some doubts.

1) How should I proceed with the sample size in the pilot study? Can I have a sample of 5 companies in the pilot study?

2) In the pilot ...

Dear Professor Bliemer,

Thanks for your response. However, I would like to clarify a doubt. In my last post, I asked if I could develop a pilot study with this syntax.

design
;alts = BUS,CAR
;rows =12
;block =2
;eff = (mnl,d)
;cond:
if (CAR.Cost_CAR = 6, CAR.Time_CAR <> 25)
;model:
U(BUS) = b0 ...

Dear Professor Bliemer,

Thank you for the answer and suggestions.
I would like to clarify some final doubts. Based on your answer, can I develop a design for a pilot study with this syntax?

design
;alts = BUS,CAR
;rows =12
;block =2
;eff = (mnl,d)
;cond:
if (CAR.Cost_CAR = 6, CAR.Time_CAR <> 25 ...