Displaying 20 results from an estimated 11000 matches similar to: "multiple comparisons for MANOVA results"
2008 Mar 31
0
MANOVA, SCC and multiple comparisons
Bonjour,
we wanted to fit a manova as descripted in Marieta /et al./ 2003,
"convergent habitat segregation of /Aedes aegyptii/ and /Aedes
albopictus/ (Diptera: /Culicidae/) in Southern Brazil and Florida", /J.
Med. Entomol./, *40* (6), 785-794. They did their analysis with SAS
software.
We have the same kind of data with two insect species and city, habitat
and season factors. We
2017 Nov 03
0
Pairwise comparison, TukeyHSD, glht, ANCOVA
Hi,
I'm wondering if i can use the function "TukeyHSD" to perform the all pairwise comparisons of a "aov()" model with one factor (e.g., GROUP) and one continuous covariate (e.g., AGE). I did for example:
library(multcomp)
data('litter', package = 'multcomp')
litter.aov <- aov(weight ~ gesttime + dose, data = litter)
TukeyHSD(litter.aov, which =
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
2008 Sep 09
0
New member with question on multiple comparisons in mixed effects models
Dear fellow R.users/.lovers,
I am very new to both R and this list, so I hope you will be patient with me in the beginning if my enquiries are inappropriate/unclear.
I am trying to perform some rather complex statistical modelling using mixed-effects models.
I have, after a rather difficult beginning, finally boiled down my model (using the lme function in nlme) to a couple of fixed effects
2018 May 26
0
TukeyHSD for multiple response
Hi Sergio
Doing those tests 30 times is going to give you a huge Type I error
rate, even if there was a function that did that. There is a reason
why TukeyHSD doesn't make it easy.
In general, if there are useful comparisons among the species, you are
better off setting up and testing contrasts than doing all-pairwise
Tukey tests.
Also, the PCA scores are ordered in terms of variance
2011 Oct 23
0
manova/tukey test
Hello,
I am trying to do a manova test in r, and have used the "manova" function to
test differences between two dependent variables. The results were
significant for the whole model, but the sources I've read say that in order
to do a post-hoc multiple comparison, I have to do separate aovs for each
dependent variable, then call the TukeyHSD function.
I have used the TukeyHSD with
2006 Mar 30
2
Unbalanced Manova
Dear all,
I need to do a Manova but I have an unbalanced design. I have
morphological measurements similar to the iris dataset, but I don't have
the same number of measurements for all species. Does anyone know a
procedure to do Manova with this kind of input in R?
Thank you very much,
Naiara.
--------------------------------------------
Naiara S. Pinto
Ecology, Evolution and Behavior
1
2012 May 11
0
Additional info: help with SMATR: help with pairwise comparisons using MA regression?
Also, this works (taking out multcomp=TRUE, multcompmethod="adjusted"):
com.test=ma(Head.W1~Leg.3.1+Site, type="elevation", data=queens)
print(com.test)
....so for some reason it will do an MA regression on all my data
point together, but shows an error when I try to do pairwise
comparisons between groups.
Thank you,
Ioulia
--------
On Fri, May 11, 2012 at 2:09 AM, Ioulia
2010 Mar 15
1
Multiple comparisons for a two-factor ANCOVA
I'm trying to do an ANCOVA with two factors (clipping treatment with two
levels, and plot with 4 levels) and a covariate (stem diameter). The
response variable is fruit number. The minimal adequate model looks like
this:
model3<-lm(fruit~clip + plot + st.dia + clip:plot)
I'd like to get some multiple comparisons like the ones from TukeyHSD, but
TukeyHSD doesn't work with the
2012 Feb 13
0
pairwise comparisons with multcomp package
Hi,
I've got this model and following Hothorn et al advices, I used glht for a
post hoc comparison
> modezqM<-glm(rojos~estacion*zona3,quasipoisson,subset=(edadysexo=="M"))
> anova(modezqM,test="F")
Df Deviance Resid. Df Resid.
Dev F Pr(>F)
NULL 293 41148
2003 Nov 05
2
Multiple comparisons with a glm
I've never seen anything written about multiple comparisons,
as in the multcomp package or with TukeyHSD, but using a glm.
Do such procedures exist? Are they sensible?
Are there any packages in R that implement such comparisons?
Thank you.
--
Ken Knoblauch
Inserm U371
Cerveau et Vision
18 avenue du Doyen Lepine
69675 Bron cedex
France
Tel: +33 (0)4 72 91 34 77
Fax: +33 (0)4 72 91 34 61
2009 Aug 11
1
nested repeated measures MANOVA using adonis
I am trying to apply a permuation-based MANOVA (Anderson 2001) to a set of
morphological data from three ecomorphs of fish reared under two different
conditions and measured at two points during ontogeny. I will supply a
distance matrix based on Procrustes distances calculated outside of vegan.
I have not found an example of a design such as this for adonis. However, I
have designed my factors
2008 Apr 28
0
restricting pairwise comparisons of interaction effects
I'm interested in restricting the pairwise comparisons of interaction
effects in a multi-way factorial ANOVA, because I find comparisons of
interactions between all different variables different to interpret.
For example (supposing a p<0.10 cutoff just to be able to use this
example):
> summary(fm1 <- aov(breaks ~ wool*tension, data = warpbreaks))
Df Sum Sq Mean Sq F
2010 Oct 22
2
visualize TukeyHSD results
I am a new R user but a long time SAS user. I searched for a response to this question but no luck, so forgive me if this topic has been covered before. I am running a TukeyHSD post hoc test after running an ANOVA. I get the results of all pairwise comparisons, no problem. However, the output table is a little "busy", and I'd like to make the output easier to read. Specifically, I
2012 Nov 19
0
glht function in multcomp gives unexpected p=1 for all comparisons
Hi, I have data with binomial response variable (survival) and 2 categorical independent variables (site and treatment) (see below).? I have run a binomial GLM and found that both IVs and the interaction are significant.? Now I want to do a post-hoc test for all pairwise comparisons to see which treatment groups differ.? I tried the glht function in the multcomp package, but I get surprising
2002 Jul 01
1
How to do multiple comparisons with multiple error strata
Hello,
the title says it all. I have an ANOVA model with
"Error" term and the functions TukeyHSD or those
from the "multcomp" package seem not to work with
such a model. Assuming that the object returned from
aov() function with multiple strata is a list of aov objects,
I tried something like TukeyHSD(aov.1$Within), but this
does not work either.
Does somebody have a
2012 Jul 30
0
pairwise comparisons in accordance with regression fit
Hello,
I have a unconventional question arising from my current master thesis on
regression modeling. Suppose we have fitted a (linear) relationship between
a dependent variable y and an independent variable x. Now we choose two
points on the x-axis, i.e. according to percentiles x10 and x90. These two
points are chosen to select the data points for two groups in order to
perform pairwise
2005 Jul 15
1
Adjusted p-values with TukeyHSD (patch)
Dear R-developeRs,
Attached follows a patch against svn 34959 that adds the
printing of p-values to the TukeyHSD.aov function in stats package. I
also updated the corresponding documentation file and added a 'see also'
reference to the simint function of the multcomp package.
As it was already brought up in a previous thread [1] in R-help,
one can obtain the adjusted
2012 Oct 19
2
Post Hoc tests for ANOVA
Hi,
I was trying to figure out how to do post-hoc tests for Two Way ANOVAs and
found the following 2 approaches:
a. Do pairwise t-tests (bonferroni corrected) if one finds significance with
the ANOVA.
Link-
http://rtutorialseries.blogspot.com/2011/01/r-tutorial-series-two-way-anova-with.html
b. Do TukeyHSD on an aov model
Link-
2008 Jul 31
0
multiple comparison
Dear all,
I was trying to understand how "multcomp" package works by running the
examples given in the documentation.
However I still don't understand when it comes to multiple comparison set by
user (please refer to "Ksub" in the code). Therefore I run 2 other cases
along with the original example (case 1), with the expectation I'll get the
point from the output. The