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contrast
2007 Nov 22
3
anova planned comparisons/contrasts
...his case is the grand mean, but what are the other
values? They appear to be the difference between one of the contrast
groups and the grand mean -- wouldn't an estimate of the differences
between the contrasted groups be more appropriate, or am I (likely)
misinterpreting this?
Thanks!
Tyler
MyContrast <- function(Var, Group, G1, G2, G3=NULL) {
## Var == data vector, Group == factor
## G1, G2, G3 == character vectors of factor levels to contrast
nG1 = sum(Group %in% G1)
nG2 = sum(Group %in% G2)
GrandMean = mean(Var[Group %in% c(G1, G2, G3)])
G1Mean = mean(Var[Group %in% G1])...
2004 May 27
2
ANOVA and contrasts
Dears members of R list,
I would like that a more experienced R user help me to complete
this analysis:
r = gl(3, 8, label = c('r1', 'r2', 'r3'))
e = rep(gl(2, 4, label = c('e1', 'e2')), 3)
y = c(26.2, 26.0, 25.0, 25.4, 24.8, 24.6, 26.7, 25.2, 25.7, 26.3, 25.1, 26.4,
19.6, 21.1, 19.0, 18.6, 22.8, 19.4, 18.8, 19.2, 19.8, 21.4, 22.8, 21.3)
df =