Displaying 20 results from an estimated 10000 matches similar to: "Tukey Type III SS vs Type I SS"
2012 Jan 02
1
Is using glht with "Tukey" for lme post-hoc comparisons an appropriate substitute to TukeyHSD?
Hello,
I am trying to determine the most appropriate way to run post-hoc
comparisons on my lme model. I had originally planned to use Tukey
HSD method as I am interested in all possible comparisons between my
treatment levels. TukeyHSD, however, does not work with lme. The
only other code that I was able to find, and which also seems to be
widely used, is glht specified with Tukey:
2013 Jan 14
1
Tukey HSD plot with lines indicating (non-)significance
Dear list members,
I'm running some tests looking at differences between means for various
levels of a factor, using Tukey's HSD method.
I would like to plot the data as boxplots or dotplots, with horizontal
significance lines indicating which groups are statistically
significantly different, according to Tukey HSD. Here's a nice image
showing an example of such a graphical
2007 Nov 23
1
multiple comparisons/tukey kramer
Hi,
I'm trying to make sense of the options for multiple comparisons
options in R. I've found the following options:
pairwise.t.test, which provides standard t-tests, with options for
choosing an appropriate correction for multiple comparisons
TukeyHSD, which provides the usual Tukey test
glht(package multcomp), which provides a variety of options
>From the help list, it appears
2011 Oct 21
1
Multiple factorial comparison LSD
Please help. I really like R and I have been looking at how to do LSD multiple comparison test with data that has more than one factor. So far, I am unsuccessful. Please help!
Me
2008 Dec 23
0
Tukey on interaction means after lmer
Dear Colleagues,
I fit this model:
mod1 <- lmer(x~category*comp+(1|id),data=impchiefsrm)
where category has 4 levels and comp has 8 levels.
These work:
glht(mod1, linfct=mcp(category="Tukey")
glht(mod1, linfct=mcp(comp="Tukey")
What I'd like is (conceptually):
glht(mod1, linfct=mcp(category:comp="Tukey")
but it gives a syntax error.
Any help is
2007 Apr 16
1
Difficulties Using glht.mmc to Calculate Tukey Intervals for Means
Greetings,
In the following one-way ANOVA I am attempting to calculate the means of
each treatment along with their 95% Tukey confidence intervals for the data
shown below using a routine from the HH package.
library(HH)
options(digits=10)
# load data
treat
voltage
1
130
1
74
1
155
1
180
2
150
2
159
2
188
2
126
3
138
3
168
3
110
3
160
4
34
2010 Aug 06
0
Tukey post hoc test for testing interaction between two or more predictors
Hi everyone,
I woudl like to apply a Tukey post hoc after a repeated measure ANOVA. I
followed the suggestions that I found in this help -list especially
this one:
/[R] Tukey HSD (or other post hoc tests) following repeated measures ANOVA
You want to use lme() in package nlme, then glht() in the multcomp package.
This will give you multiplicity adjusted p-values and confidence intervals.
2010 Aug 09
0
Tukey post hoc test and two way repeated measures ANOVA
Dear all,
I have a serious problem in applying Tukey post hoc after a repeated
measure ANOVA. I
followed the suggestions that I found in this help -list especially
this one:
//[R] Tukey HSD (or other post hoc tests) following repeated measures ANOVA
You want to use lme() in package nlme, then glht() in the multcomp package.
This will give you multiplicity adjusted p-values and confidence
2008 Nov 18
1
Tukey HSD following lme
Hi everyone
I'm using Tukey HSD as post-hoc test following a lme analysis. I'm
measuring hemicelluloses in different species treated with three
different CO2 concentrations (l=low, m=medium, h=high). The whole
experiment is a split-plot design and the Tukey-function from the
package multcomp is suitable for lme-analysis with random factors.
The analysis works fine but I get a non
2009 Apr 21
3
broken example: lme() + multcomp() Tukey on repeated measures design
I am trying to do Tukey HSD comparisons on a repeated measures expt.
I found the following example on r-help and quoted approvingly elsewhere.
It is broken. Can anyone please tell me how to get it to work?
I am using R 2.4.1.
> require(MASS) ## for oats data set
> require(nlme) ## for lme()
> require(multcomp) ## for multiple comparison stuff
> Aov.mod <- aov(Y ~ N + V +
2017 Nov 28
1
Repeated measures Tukey
Thanks in advance for your help.
I am running a repeated measures ANOVA in r. The same group undergoes to
four different treatment conditions. So, all individuals are treated with
treatments A, B, C and D in four different occasions.
Once I get a significant ANOVA, I first run a paired samples t-test using
the code:
t.test(X1,X2,paired=TRUE) #being x1 the punctuation after treatment 1 and
x2 the
2008 Apr 10
1
Tukey in R, extracting values
hey,
how can i extract the values from the CI's when i use following code for a
tukey test?
the output shows three CI's and i know it should work with 'names but i
don't really know how...
thanks
library(multcomp)
data1$soort<-as.factor(data1$soort)
amod<-aov(waarde~soort,data=data1)
g<-glht(amod, linfct=mcp(soort = "Tukey"))
confint(g)
--
View this message in
2009 Mar 14
1
dispcrepancy between aov F test and tukey contrasts results with mixed effects model
Hello,
I have some conflicting output from an aov summary and tukey contrasts
with a mixed effects model I was hoping someone could clarify. I am
comparing the abundance of a species across three willow stand types.
Since I have 2 or 3 sites within a habitat I have included site as a
random effect in the lme model. My confusion is that the F test given by
aov(model) indicates there is no
2012 Jun 13
1
Tukey Kramer with ANOVA (glm)
Hello,
I am performing a BACI analysis with ANOVA using the following glm:
fit1<-glm(log(Cucs_m+1)~(BA*Otter)+BA+Otter+ID+Primary, data=b1)
The summary(aov(fit1)) shows significance in the interaction; however, now I
would like to determine what combinations of BA and Otter are significantly
different (each factor has two levels). ID and PRIMARY substrates are
categorical and included in
2010 Mar 09
0
Tukey test for Mixed Effects Model with more than 1 fixed effect?
I am trying to decipher, via post hoc test (Tukey), which of my sites
differ from eachother. I have 4 sites, 2 sets of In vs Out (MPA) in
separate Regions. Therefore my Mixed Effects Model code has 2 fixed
effects:
CB.lme <- lme(AsinCB~ In_Out*Region, random = (~1| site.trans/Quadrat)
, data = Subsampled_props, control = lmeControl(maxIter = 500,
msMaxIter = 500, msMaxEval = 500))
2011 Sep 28
0
Trouble with performing post hoc analysis Tukey for lme model using ghlt
Hi,
I am new to R and I am trying to perform a post hoc tukey test using the
multcomp package's ghlt for a lme model. My first attempt at doing so gave
me an output, HOWEVER I have tried to do this again, it keeps coming up with
the error:
(Error in contrMat(table(mf[[nm]]), type = types[pm]) :
less than two groups)
My model is looking at effect of incubation temperature (3 groups) on
2008 May 28
2
Tukey HSD (or other post hoc tests) following repeated measures ANOVA
Hi everyone,
I am fairly new to R, and I am aware that others have had this
problem before, but I have failed to solve the problem from previous
replies I found in the archives.
As this is such a standard procedure in psychological science, there
must be an elegant solution to this...I think.
I would much appreciate a solution that even I could understand... ;-)
Now, I want to calculate a
2012 Jul 07
0
Questions about glht() and interpretation of output from Tukey's in multcomp
Hi,
I have a few questions about glht() and the interpretation of output from
Tukey's in multcomp package for lme() model.
The main issue is that I noticed that a plot that I produced with code
letters seem to contradict the graph itself. I provide data and code
below. I end with my questions.
A few things about data set. "LMA.vcp" is continuous response variable.
2010 Dec 02
5
Tukey Test, lme, error: less than two groups
Dear R-group,
I am trying desperately to get this Tukey test working. Its my first time
here so I hope my question is not too stupid, but I couldn't find anything
helpful in the help or in the forum.
I am analysing a dataset of treated grasses. I want to find out, if the
grasses from different Provenances react differently.
In the aov test I found a significance for the combination Treatment
2010 May 17
1
Query on linear mixed model
Hi R Forum
I am a newbie to R and I have been amazed by what
I can get my team to accomplish just by
implementing Scripting routines of R in all my
team's areas of interest..
Recently i have been trying to adopt R scripting
routine for some analysis with longitudanal data..
I am presenting my R script below that I have
tried to make to automate data analysis for
longitudanal data by employing