R help - Apr 2012 - Fisher's LSD multiple comparisons in a two-way ANOVA

Hi there,

Is there a function that can do a Fisher's LSD multiple comparisons in a 
two-way ANOVA? I hope to get a result similar with TukeyHSD(). 
Especially, I hope to know the significance of comparisons between the 
interactions of two factors.

In the following example:

x <- c(76, 84, 78, 80, 82, 70, 62, 72, 71, 69, 72, 74, 66, 74, 68, 66, 
69, 72, 72, 78, 74, 71, 73, 67, 86, 67, 72, 85, 87, 74, 83, 86, 66, 68, 
70, 76, 78, 76, 69, 74, 72, 72, 76, 69, 69, 82, 79, 81)
a <- rep(c("A1","A2"), each = 24)
b <- rep(c("B1","B2","B3"), each =8, times = 2)
a <- factor(a)
b <- factor(b)
x.aov <- aov(x~a*b)

I hope to obtained the results similar with"

http://www.gigawiz.com/images12/twowayrmposthoc.jpg

Any suggestions or comments will be really appreciated.

Regards,
Jinsong

yes.  See ?glht in the multcomp package, and the examples using glht in ?MMC in
the HH package.

Sent from my iPhone

On Apr 3, 2012, at 6:16, Jinsong Zhao <jszhao at yeah.net> wrote:
> Hi there,
> 
> Is there a function that can do a Fisher's LSD multiple comparisons in
a two-way ANOVA? I hope to get a result similar with TukeyHSD(). Especially, I
hope to know the significance of comparisons between the interactions of two
factors.
> 
> In the following example:
> 
> x <- c(76, 84, 78, 80, 82, 70, 62, 72, 71, 69, 72, 74, 66, 74, 68, 66,
69, 72, 72, 78, 74, 71, 73, 67, 86, 67, 72, 85, 87, 74, 83, 86, 66, 68, 70, 76,
78, 76, 69, 74, 72, 72, 76, 69, 69, 82, 79, 81)
> a <- rep(c("A1","A2"), each = 24)
> b <- rep(c("B1","B2","B3"), each =8, times
= 2)
> a <- factor(a)
> b <- factor(b)
> x.aov <- aov(x~a*b)
> 
> I hope to obtained the results similar with"
> 
> http://www.gigawiz.com/images12/twowayrmposthoc.jpg
> 
> Any suggestions or comments will be really appreciated.
> 
> Regards,
> Jinsong
> 
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