Displaying 7 results from an estimated 7 matches for "woodenergy".
2007 Jan 09
2
posthoc tests with ANCOVA
dear all,
I want to perform a posthoc test for my ANCOVA:
a1<-aov(seeds~treatment*length)
With
summary(glht(a1, linfct = mcp(treatment = "Tukey")))
R tells me: "covariate interactions found -- please choose appropriate
contrast"
How do I build these contrasts?
Ideally, I would like to have the posthoc test for the ANCOVA including
a block-effect
2011 Dec 11
2
multiple comparison of interaction of ANCOVA
...39; 0.01 '*' 0.05 '.' 0.1 ' ' 1
As you have seen, the interaction effect is significant. I hope to use
TukeyHSD() or glht() to do multiple comparison on Trt:year. However, for
variable year is not a factor, they all give error messages.
I try to follow the demo("MMC.WoodEnergy") in HH package, as follwoing:
> library(HH)
> mca.1993 <- mcalinfct(mydata.aov, "Trt")
> non.zero <- mca.1993[,5:6] != 0
> mca.1993[,5:6][non.zero] <- 1993 * sign(mca.1993[,5:6][non.zero])
> summary(glht(mydata.aov, linfct=mca.1993))
Simultan...
2010 May 30
1
How to use the function "glht" of multcomp package to test interaction?
It's been a few weeks I'm racking my brains on how to use the function glht
the package multcomp to test interactions. Unfortunately, the creator of the
package forgot to put a sample in pdf package how to do it. I have looked in
several places, but found nothing. If someone for the love of God can help
me I'll be extremely grateful. The model is glm.
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2011 Apr 27
2
multiple comparisons on a between factor
Dear list,
im facing an issue of statistical data analysis that I consider myself
unable to resolve in R so i hope to get some valuable insights from you. i
run an ANOVA with four factors; factor4 is an between factor (two different
groups measured), the others are withins (tested across /all/ subjects).
accordingly, my model looks as follows:
fm1
2007 Jan 29
1
Fwd: Re: LSD multiple comparison test
I am returning this to the R-help list. Please keep followups on the list.
Yes, it can be done. It is not currently easy because multcomp doesn't
have the syntax yet. Making this easy is on Torsten's to-do list for the
multcomp package.
See the MMC.WoodEnergy example in the HH package. The current version on CRAN
is HH_1.17. Please see the discussion of this example in R-help:
https://stat.ethz.ch/pipermail/r-help/2007-January/123451.html
---- Original message ----
>Date: Mon, 29 Jan 2007 16:42:35 +0100 (CET)
>From: "Jorge Lampurlanes Cas...
2007 Jan 29
3
Multiple comparisons when interacction
In the model:
lm.1 <- lm(variable ~ BLOC + TIL * YEAR , data=selvanera)
I found TIL*YEAR interaction significant. Then I am trying to compare
means of the different levels of TIL inside every YEAR using:
mc.2 <- glht(lm.1, linfct = mcp(TIL*YEAR="Tukey"))
summary(mc.2, test = univariate())
but it does not work.
There is any way of doing this, like the SLICE option in
2012 Mar 25
2
avoiding for loops
I have data that looks like this:
> df1
group id
1 red A
2 red B
3 red C
4 blue D
5 blue E
6 blue F
I want a list of the groups containing vectors with the ids. I am
avoiding subset(), as it is
only recommended for interactive use. Here's what I have so far:
df1 <- data.frame(group=c("red", "red", "red", "blue",