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Hi John,

thank you very much for your reply.

I run the code you wrote and the software does produce designs but these do not meet the requirement of the sum of four attributes to be 100. Is there any way for that to happen?

Thanks

Alberto

Michiel,

thank you very much for your reply. I added the Federov Algorithm to the code and relocated the semicolumns at the beginning of the line.

Unfortunately the software seems to be crashing (as the frame of the output window appears but without text) then after several minutes the following ...

Hi all,

I am quite new to NGene and have been trying in the last days to prepare a design very similar to the one used by Li, Hensher and Rose (2010). Willingness to Pay for travel time reliability in passenger transport: a review and some new empirical evidence. TR-E 46:384-403.

My design ...