Displaying 20 results from an estimated 32 matches for "posthocs".
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posthoc
2018 Jan 16
1
Letters group Games-Howell post hoc in R
Hello everybody,
I use the sweetpotato database included in R package:
data(sweetpotato) This dataset contains two variables: yield(continous
variable) and virus(factor variable).
Due to Levene test is significant I cannot assume homogeneity of variances
and I apply Welch test in R instead of one-way ANOVA followed by Tukey
posthoc.
Nevertheless, the problems come from when I apply posthoc
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
2013 Dec 18
1
Fwd: Bad \usage lines question
Dear colleagues,
In checking a function I am adding to an R package, I get the following
warning pair:
...
Bad \usage lines found in documentation object 'nominal':
"\\method{print}{nominal}"(x, max.print = 10,
posthoc = "std.pearson.residuals.sign",
assoc = ifelse("univariate"
list(c("N", "alpha.X2",
2009 Mar 30
0
Kruskal-Wallis-test: Posthoc-test?
Hello.
We have some questions concerning the statistical analysis of a dataset.
We aim to compare the sample means of more than 2 independent samples; the
sample sizes are unbalanced. The requirements of normality distribution and
variance homogeneity were not met even after transforming the data. Thus we
applied a nonparametric test: the Kruskal-Wallis-test (H-Test). The null
hypothesis was
2010 Apr 15
0
lme posthoc comparisons in R
Hi there, I was hoping to post this message. Im hoping I;ve got the right spot?!
Hi there,
sorry for basic question but im very new to R. Im trying to run a lme model with two categorical variables, each having 6 (for the explanatory variable C.f) and 5 levels (for expl. variable D.f) respectively. The lme runs fine, summary and anova commands are ok. But now i've tried running posthoc
2002 Jan 23
1
Posthoc tests for ANOVA
Dear List,
are there post-hoc tests like Scheffe, LSD, etc. available after ANOVA test
is performed with significant F-statistic?
I have tried
help.search("Scheffe"),
but "No documentation found" (and I have most of packages installed).
Probably there are such tests in R, and I am just searching badly...
My second question is: Which test/method I should use for ANOVA-like
2006 Oct 24
1
Posthoc tests for 3-way ANOVA analysis
Hi All,
I have performed a 3-way ANOVA analysis for my
experimental data using aov function. My simple R
funtion for this is:
3aof <- function(x){
m <- data.frame(R,S,T, x);
anova(aov(x ~ R+S+T+R*S+R*T+S*T+R*S*T, m) )
}
Now, I am getting P values for all the main and
interactions effects. If I want to perform postdoc
test on one of my main effects, say T, what method I
should use (i have
2010 Aug 30
0
Posthoc test for 3-way interaction (log-linear model)
Hi,
I have analyzed my data using log-linear model as seen below:
> yes.no <- c("Yes","No")
> tk <- c("On","Off")
> ats <- c("S","V","M")
> L <- gl(2,1,12,yes.no)
> T <- gl(2,2,12,tk)
> A <- gl(3,4,12,ats)
> n <- c(1056,4774,22,283,326,2916,27,360,274,1770,15,226)
>
2010 Oct 20
1
Please help: ANOVA with SS Type III for unequal sample sized data
Dear R experts,
I'm beginner.
My question about ANOVA for unequal sample sized data should be obsolete but
I can not clarify it.
I have a dataset from 23 males and 18 females.
I measured one condition('cond') with 4 levels.
So I'd like to see main effect of gender, cond and gender by cond
interaction and also postHoc test. (In fact, I have to do anova 90 times)
*
1. Question
2009 Nov 02
1
Interaction contrasts or posthoc test for glm (MASS) with ANOVA design
Dear R experts
I am running a negative-binomial GLM (glm.nb) to test the null hypotheses
that species 1 and 2 are equally abundant between site 1 and site2, and
between each other. So, I have a 2x2 factorial design with factors Site
(1,2) and Taxon (1,2).
Since the Site:Taxon interaction is significant, I need to do the equivalent
to a "post-hoc test" for ANOVA, however, the same tests
2013 May 06
0
Comparaciones multiples lmer
Hola,
Lo primero muchas gracias a todos por vuesta habitual ayuda. Llevo meses
con las funciones lmer, pero tengo un problema no se como plantear unas
comparaciones multiples una vez demostrado que el factor tiene diferencias
significativas.
Tengo multiples opciones,
SoluciĆ³n A: una es hacer un bonferroni a saco (pero eso me chirria ya que
tego muchos datos)
SoluciĆ³n B: Otra es utilizar glht,
2009 Dec 04
2
csimtest function in multcomp package
Hello all,
Quick question: I want to do posthoc contrasts for a linear mixed
effects model. However, when trying to use the csimtest function in
multcomp package I receive an error message saying it cannot find the
function, even after installing and loading package multcomp.
Any pointers would be greatly appreciated
Daniel
2007 Jun 15
1
complex contrasts and logistic regression
Hi,
I am doing a retrospective analysis on a cohort from a designed trial,
and I am fitting
the model
fit<-glmD(survived ~ Covariate*Therapy + confounder,myDat,X=TRUE,
Y=TRUE, family=binomial())
My covariate has three levels ("A","B" and "C") and therapy has two
(treated and control), confounder is a continuous variable.
Also patients were randomized to
2010 Oct 19
2
ANOVA stuffs_How to save each result from FOR command?
Dear R experts,
I'm new in R and a beginner in terms of statistics.
It should be simple question, but definitely difficult to solve it by
myself.
I'd like to see main effect of group(gender: sample size is
different(M:F=23:18) and one of condition(cond) and the interaction at each
subset from 90 datasets
So I perform anova 90 times using a command like below;
for(i in 1:90)
2006 Jan 15
1
Multiple comparison and two-way ANOVA design
Dear useRs,
I'm working on multiple comparison design on two factor (2 3 levels)
ANOVA. Each of the tests I have tried (Tukey, multcomp package) seem to
do only with one factor at a time.
fm1 <- aov(breaks ~ wool * tension, data = warpbreaks)
tHSD <- TukeyHSD(fm1, "tension", ordered = FALSE)
$tension
diff lwr upr p adj
M-L -10.000000 -19.35342
2009 Aug 14
1
post hoc test after lme
Hi!
I am quiet new with R and I have some problems to perform a posthoc test
with an lme model.
My model is the following:
>lme1<-lme(eexp~meal+time, random=~1|id,na.action=na.omit)
and then i try to get a post hoc test:
>summary(glht(lme1,linfct=mcp(meal="Tukey)))
but I get a warning message: Erreur dans as.vector(x, mode) : argument
'mode' incorrect
Thank you for your
2007 Oct 26
1
Effect sizes
I'm just curious . . . if effect sizes are so important, and possibly a better way of looking at results than p-values, since they don't depend on effect size (Kline,2004; Murphy and Myors, 2004), why don't any of the classical tests, like t.test or glht specified for Tukey's posthocs, return effect sizes? I say "classical" because I'm sure there may be packages out there, not in the base program, which do return effect sizes, but do they also return everything glht does, which are confidence intervals for mean differences, t-values and p-values, standard error plu...
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 Mar 15
1
Anova
Hi all,
I apologize for what might be a silly question.
I am interested in doing a one way anova.
This is not too hard in and of itself, either with anova, aov or oneway.test
.
However, I need to
1) get pvalues,
2) do a posthoc analysis with Tukey HSD,
3) and have (sometimes) an unbalanced design.
I just can't seem to put all the pieces together.
Any suggestions?
Thanks in advance,
Dan.
2010 Apr 29
1
R Anova Analysis
Dear all,
I have a quite basic questions about anova analysis in R, sorry for
this, but I have no clue how to explain this result.
I have two datasets which are named: nmda123, nmda456. Each dataset has
three samples which were measured three times. And I would like to
compare means of them with Posthoc test using R, following please see
the output:
(CREB, mCREB and No virus are the name of