Re: [R] Two-way linear model with interaction but without one main effect

2012-06-12 Thread Helios de Rosario
gt; Van: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] > Namens Helios de Rosario > Verzonden: dinsdag 12 juni 2012 13:35 > Aan: r-help@r-project.org > Onderwerp: [R] Two-way linear model with interaction but without one main > effect > > Hi, > >

Re: [R] Two-way linear model with interaction but without one main effect

2012-06-12 Thread ONKELINX, Thierry
ject.org Onderwerp: [R] Two-way linear model with interaction but without one main effect Hi, I know that the type of model described in the subject line violates the principle of marginality and it is rare in practice, but there may be some circumstances where it has sense. Let's take t

[R] Two-way linear model with interaction but without one main effect

2012-06-12 Thread Helios de Rosario
Hi, I know that the type of model described in the subject line violates the principle of marginality and it is rare in practice, but there may be some circumstances where it has sense. Let's take this imaginary example (not homework, just a silly made-up case for illustrating the rare situation):