blue sky
2010-Mar-05 13:59 UTC
[R] How to compute contrast between more than 2 cells? (in contrast package)
I have contacted the author of the contrast package, but received no reply. Could somebody that I have the experience on this package give me some hint. In the vignette of the package, I only see example to compute contrasts between 2 cells. Is there a way to compute the contrast between more than 2 cells. For example, is there a way to compute the contrast indicated by beta_3 (on page 4 of the vignette), which is a linear combination of the 4 cell means. Is there a way to use your contrast() function to compute this contrast?