topic Re: D-Optimal Design with Constraints in a Mixture in Discussions

D-Optimal Design with Constraints in a Mixture

Al_Perr_1988 — Mon, 07 Aug 2023 07:17:25 GMT

Hallo,

is it possible to define an experimental space where the constraints are non-symmetrical? Meaning for example a space defined by the blue line below. Thanks very much for taking the time in advance!

Re: D-Optimal Design with Constraints in a Mixture

bobmorrane — Mon, 07 Aug 2023 13:35:30 GMT

YOu might be able to do this by using the "set linear constraint" in the DOE dialog. But you will need to figure out the right equation to get the right shape...

Re: D-Optimal Design with Constraints in a Mixture

Al_Perr_1988 — Wed, 09 Aug 2023 14:29:38 GMT

Do you have an idea? I am really stuck :).

Thanks

Alex

Re: D-Optimal Design with Constraints in a Mixture

Dan_Obermiller — Wed, 09 Aug 2023 14:58:42 GMT

You should be able to accomplish this by adding two linear constraints to the design. From the picture, it appears that Component A ranges from 0.2 to 0.3. Component B from 0.45 to 0.8. And Component C ranges from 0 to 0.25. Based on that information, if you can provide the coordinates for the points highlighted in red (a zoomed in version of your picture) the linear constraints can be defined. Note that I am assuming that the start of the one constraint is for A at 0.25 and B at 0.75.