Analysis model for categorical and quantitative factors in full factorial design without center points
Hi, I am working in a experiment with categorical and continuous factors each at 4 levels without center points in full factorial design with 3 replicates (4*4*3). For the response variables, when plotted it is non-linear and tried to apply second order polynomial model for data analysis. Do you think this is right way? Does only using full factorial classical model (linear regression ) with s...