Contour formula referencing block column
Hi, I would like to get some help on troubleshooting the situation. I ran a mixture design with 3 factors, followed by augmentation with a new separate block. I then fitted the data from the initial mixture design and augmentation. Now, when I try to visualize contour on ternary plot by adding fitted formula to the 'Contour formula', I get the error message below. This makes sense since the for...