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At least I no longer have the undefined D-error, but the D-error is still too high at 0.79.

Thank you for your suggestion.

But even after modifying the constraints, it still has the undefined D-error.

I´ve attached the modified script; if you can, please, help me with this. I don´t know if it can impact the design (I think yes), (0-42, 2-12, 2-12, 2-12), I removed it to see if it could ...

Dr. Michiel,

thank you for replying. I get your point! the prob is that too many constraints will be applied which will impact the efficiency of the design. Anyway, I modified the design following your suggestions. However, the D-error is undefined.

Do you have any suggestion?

Merci,

Script ...

Dear Dr. Michiel,

I would appreciate your guidance in improving this script. I believe there is an issue—specifically, with the definition of two attributes [cafeina, sabor].

To provide some context: this is a labelled design with seven labels (Coca-Cola, Fanta, Schweppes, Pepsi, Inca Kola, 7-Up ...

Dear Michiel,

I got this error message: " Error: The modified Federov candidate set size of 2000 could not be achieved. The percentages of candidates that failed are: 95.75% due to dominance, 0% due to constraints, and 4.25% due to repeated alternatives. The candidate set size has been adjusted ...

Dear sir,

Thanks for your responses and availability. My new script is as you will find below :

design
alts = alt1*, alt2*, sq*
;rows = 24
;block = 3,minsum,noimprov(20 secs)
;eff = (mnl,d,mean)
;alg = mfederov (stop=noimprov (2 mins))

;reject:

alt1.WATER = 0 and alt1.BIO = 2,
alt2.WATER = 0 ...

Dear sir,

Please find the script attached:

design
alts = alt1*, alt2*, sq*
;rows = 18
;block = 3,minsum
;eff = (mnl,d)
;alg = mfederov

;require:
sq.WATER = 0,
sq.BIO = 0,
sq.RECR = 0,
sq.GAS = 0

;reject:

alt1.WATER = 0 and alt1.BIO = 2,
alt2.WATER = 0 and alt2.BIO = 2,
alt1.BIO = 2 and alt1 ...

Dear sir,

Thanks for your response.

I don't know if you can see the previous EDIT [Edit Icon] thatI did in this conversation but I modified the script yesterday.

I proceed step by step, first at all, I tried to run the script by including just the significant coefficients and I left the rest ...

Dear Sir,

You will find the design with the new values of priors. Let me give you more explanations about the significance of theses coefficients, Price : significant, health :insignificant, BIO1 (HIGH LEVEL) : significant, BIO2 : significant, WQ1 (HIGH LEVEL) : significant, WQ2 : insignificant ...

Dear Sir,

I come back to you after conducting a pilot survey with 30 persons. As I know one of the reasons for conducting a pilot survey especially when scripting a bayesian efficient design with Near Zero priors is to obtain a clear vision about these priors. First results generated by SPSS ...