Dear all
I did not find the coding rules to express quadratic formula in Anova. The SO() & PQ() command allow to build such a model, but unfortunately, the resulting info is not separated along terms of the model but grouped instead. This command
Quad_SO <- aov(Data ~ SO(H1,H2,H3))
followed by : anova(Quad_SO)" gives :
Df Sum Sq Mean F value Pr(>F)
SO(H1, H2, H3, H4, H5) 20 9.7 0.48 125.33 2.2e-16
Even worst,
rsm_SO <- rsm(Data~ SO(H1,H2,H3))
gives an horrible terms naming which makes sensitivity bargraph unreadable...
..... **TWI(H1, H2, H3)H1:H3...... PQ(H1, H2, H3)H3^2
I have not found any relevant example on how generate quadratic model using symbolic notation or a way to expand terms from SO or PQ commands
Thanks a lot for you help...
To help us help you, could you please prepare a reproducible example (reprex) illustrating your issue? Please have a look at this guide, to see how to create one:
Hi, have you tried following Andrés' guide? I think it's very clear. Otherwise, you could try this other one, which is probably as simple as it can get
just note that now you don't need to use the dev version anymore, you can directly use the CRAN one. Give these guides a try! Learning to use reprexes is fundamental in order to get the most from this community.