https://community.jmp.com/t5/Discussions/Making-a-custom-design/m-p/929359#M108670 <P>In the custom design when i create and one of the factors is set to hard, there is no d efficiency. When evaluating the table the d efficiency changes. why?</P> Fri, 06 Feb 2026 14:59:10 GMT RatioHyena255 2026-02-06T14:59:10Z https://community.jmp.com/t5/Discussions/Making-a-custom-design/m-p/929359#M108670 <P>In the custom design when i create and one of the factors is set to hard, there is no d efficiency. When evaluating the table the d efficiency changes. why?</P> Fri, 06 Feb 2026 14:59:10 GMT https://community.jmp.com/t5/Discussions/Making-a-custom-design/m-p/929359#M108670 RatioHyena255 2026-02-06T14:59:10Z https://community.jmp.com/t5/Discussions/Making-a-custom-design/m-p/929422#M108674 <P>Without going too detailed, a<SPAN>&nbsp;100% D-efficient design is typically only possible with an orthogonal, balanced, and unconstrained design space. When restrictions are introduced, a 100% efficient design is generally not possible because the constraints reduce the volume of the information matrix relative to the ideal (unconstrained) case, resulting in lower efficiency.</SPAN><SPAN class="uJ19be notranslate" data-wiz-uids="XuTw3_i,XuTw3_j" data-processed="true"><SPAN class="vKEkVd" data-animation-atomic="" data-wiz-attrbind="class=XuTw3_h/TKHnVd" data-processed="true"><SPAN aria-hidden="true" data-processed="true">&nbsp;</SPAN></SPAN></SPAN></P> <P><SPAN class="uJ19be notranslate" data-wiz-uids="XuTw3_i,XuTw3_j" data-processed="true"><SPAN class="vKEkVd" data-animation-atomic="" data-wiz-attrbind="class=XuTw3_h/TKHnVd" data-processed="true"><SPAN aria-hidden="true" data-processed="true">Your situation calls for a split-plot design.</SPAN></SPAN></SPAN></P> Fri, 06 Feb 2026 18:14:17 GMT https://community.jmp.com/t5/Discussions/Making-a-custom-design/m-p/929422#M108674 statman 2026-02-06T18:14:17Z