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This forum is for posts that specifically focus on the online (web-based) version of Ngene:

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The following is being posted for a user for whom there was a technical issue posting to the forum software:

Dear all

I am a novice in learning Ngene. Please forgive me if the question I raised may be a little simple, I am doing research on physicians' preference for generic drugs.

There are no ...

A number of Ngene users have been affected by an issue which deactivates/expires their Ngene installation. Details below.

What is the issue?

When a licensed, activated copy of Ngene launches, the following error message appears: “Your full version of Ngene has expired, and will be returned to ...

There may be some characters in the message you are posting that are not compatible with the forum software. Can you please email me at contact@choice-metrics.com with the text you want to post? I can then investigate.

Andrew

Posted on behalf of acv due to a technical error when posting.

Dear all,

We are conducting a choice experiment to determine the preferences and WTA of a sample of people for different kinds of contracts. We have 4 attributes to describe the contracts with 4, 4, 2 and 4 levels respectively. The ...

This forum is for posts that cover broader questions about designing and conducting choice experiments:

Questions about a specific experimental design issue that you are facing
The seeking of guidance on what type of experimental design to generate
Questions about experimental design theory ...

This forum is for posts that specifically focus on the desktop (Windows) version of Ngene:

Questions about the capabilities of Ngene
Questions regarding Ngene scripts and syntax
Questions about an error message generated by Ngene
Reports of a crash or bug in Ngene

Before posting, please ...

If you only know the sign of the priors, but have no idea (not even a guess) about the actual value, you can either choose a small value very close to zero (e.g. 0.001 or -0.001) or use Bayesian priors (e.g. (u,-0.3,0) for a negative prior). The sign of the prior is important as it enables Ngene to ...

Pivot designs (p.146) are not necessary in this case. The error message results because priors and attributes are configured at the first place they appear - later references to the same prior or attribute have to be specified in the same way (same prior values, same attributes, etc). So, I have ...

Hi Ben,

Strange indeed. I am looking into this closely, but in the meantime you could just add another superfluous attribute. The problem does not appear in this case, and the extra column can just be ignored - all other attributes will be orthogonal. See the syntax below.

Cheers,
Andrew

Design ...