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Great, thanks so much Michiel, I have asked lots of people and none have helped me pick up this was where I was going wrong, that I had forgotten to include a critical part of my design in my syntax

I feel so silly but glad that it all makes sense now

Great to know as well that this is a common ...

Hi Michiel

Thanks for following up

Ok, that makes more sense now why those values were occurring - I had forgot to mention the additional opt out question in my design which makes the proc and ben attributes make a bit more sense

In some ways my DCE could be considered as having a labelled, third ...

Thanks Michiel, and thanks for the quick response

Section 8.5 of the Ngene manual deals with scenario variables in which attribute levels are the same within a choice task.
Thankyou, this is exactly the kind of set up what I want, and I had wondered if treating the proc and ben variables as ...

Dear NGene team

I am working on a design with 8 attributes and two alternatives, see below (number of rows and blocks TBD based on efficiency and S estimates from design to match practical recruitment constraints):

Design
;alts = alt1, alt2
;rows = 36
;block = 3
;eff = (mnl,d)
;model:
U(alt1) = b1 ...