Displaying 20 results from an estimated 600 matches similar to: "means comparison in R (post-hoc test)"
2011 Jul 08
3
Efectos aleatorios, interaccions y SNK, LSD o Tukey
Queridos R-users:
Tengo una duda que hace mucho tiempo que estoy intentando resolver, os
explico a modo de ejemplo:
Tengo estos efectos: Año(5 niveles),Localidad (10 niveles) y genotipo
(3 niveles), año y localidad son aleatorios y genotipo es fijo (los he
escogido yo).
Me gustaría hacer obtener una tabla parecida a la Tabla Anova donde
aparezca cada factor y sus interacciones y
2005 Sep 19
1
Use of least-squares means, are they misleading?
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Hi.
Sorry for sending this question twice, but I would really like to know
your opinion on this topic.
I have been reading about the (in)convenience of using least-squares
means (a. k. a. adjusted means) in multiple comparisons (I used to
resort to them when using SAS). I even read a post in this list warning
against them, but not giving much detail.
2005 May 08
4
Monotonic regression
Hi, I'm trying to find an implementation of monotonic regression in R
and I haven't been able to find anything that's really related to
this. isoMDS in the MASS package uses monotonic regression, however,
I was wondering if there is any standalone function for monotonic
regression?
Basically what I'm trying to do is implement monotonic regression
where I can see not just the
2006 Jun 21
1
eliminating a do loop
Using a "by() statement, I am preparing ANOVA's for multiple experiments,
and using simint() to generate confidence intervals.
This works fine.
simint.by.fit <- by(analytes.dfr, list(Assay = analytes.dfr$analyte ),
function(data) (simint(value ~ tx, data = data,type='Tukey' ) ) )
I can separately prepare plots of the confidence intervals, and I can
prepare separate plots
2007 Dec 12
1
two-way categorical anova post-hoc data extraction
Hi list,
I have a question regarding post-hoc extraction of data from a two-way categorical anova.
I have a categorical anova of this form:
width ~ steepness + patchiness (4 steepness levels, 4 patchiness levels)
This simple setup answers if for the widths I collected across different levels of steepness and patchiness significant differences can be found. Is there a way to look at these
2018 Feb 13
1
LSmeans and lsmeans
Always cc the list unless there is good reason to keep your reply private.
There is no LSmeans() function in the lsmeans package.
Cheers,
Bert
Bert Gunter
"The trouble with having an open mind is that people keep coming along and
sticking things into it."
-- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )
On Tue, Feb 13, 2018 at 3:20 PM, Pius Mwansa
2018 Feb 13
1
LSmeans and lsmeans
It is in the doBy package.
Thanks
From: Bert Gunter [mailto:bgunter.4567 at gmail.com]
Sent: Tuesday, February 13, 2018 4:32 PM
To: Pius Mwansa <pmwansa at shaw.ca>
Cc: R-help <r-help at r-project.org>
Subject: Re: [R] LSmeans and lsmeans
Always cc the list unless there is good reason to keep your reply private.
There is no LSmeans() function in the lsmeans package.
2018 Feb 13
0
LSmeans and lsmeans
A cursory reading indicates that they are identical; but others more
knowledgeable than I need to confirm or deny this.
-- Bert
Bert Gunter
"The trouble with having an open mind is that people keep coming along and
sticking things into it."
-- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )
On Tue, Feb 13, 2018 at 3:38 PM, Pius Mwansa <pmwansa at
2004 Jan 18
1
multcomp, simint, simtest and computation duration
Dear R-listers,
I am trying to compute simultaneous confidence intervals with simint from the package multcomp. 230 measures (abundance) have been taken in 23 sites (factor) of a data.frame (donnees: a file can be sent on request, saved with save(donnees,file="donnees")). I would like to get all pairwise comparisons with :
mc<- simint(ren~ID,type="Tukey",data=donnees)
I
2007 Mar 21
1
how to get "lsmeans"?
Dear all,
I search the mail list about this topic and learn that no simple way is available to get "lsmeans" in R as in SAS.
Dr.John Fox and Dr.Frank E Harrell have given very useful information about "lsmeans" topic.
Dr. Frank E Harrell suggests not to think about lsmeans, just to think about what predicted values wanted
and to use the predict
2009 Mar 11
2
lsmeans in R
I need help with calculating lsmeans (adjusted means) of different terms in
a linear model including the main effect and the interaction effect terms. I
use lm to run the linear models...I previously noted from literature that
that "effects" package can be used to generate lsmeans. But I tried to use
it but could not figure out which option to use to get means. If anyone can
give an
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
2005 May 15
3
adjusted p-values with TukeyHSD?
hi list,
i have to ask you again, having tried and searched for several days...
i want to do a TukeyHSD after an Anova, and want to get the adjusted
p-values after the Tukey Correction.
i found the p.adjust function, but it can only correct for "holm",
"hochberg", bonferroni", but not "Tukey".
Is it not possbile to get adjusted p-values after
2017 Sep 29
5
Converting SAS Code
Hello all,
My statistical analysis training up until this point has been entirely done
in SAS. The code I frequently used was:
*Yield Champagin;
data yield;
set stress;
if field='YV' then delete;
if field='HB' then delete;
if barcode='16187DD4015' then delete;
if barcode='16187DD6002' then delete;
if barcode='16187DD2007' then delete;
if
2006 Jul 22
3
Multcomp
Here it is again, hope this is more clear
I am using the following data (only a small subset is given):
Habitat Fungus.yield
Birch 20.83829053
Birch 22.9718181
Birch 22.28216829
Birch 24.23136797
Birch 22.32147961
Birch 20.30783598
Oak 27.24047258
Oak 29.7730014
Oak 30.12608508
Oak 25.76088669
Oak 30.14750974
Hornbeam 17.05307949
Hornbeam 15.32805111
Hornbeam 18.26920177
Hornbeam 21.30987049
2012 Apr 03
1
Imputing missing values using "LSmeans" (i.e., population marginal means) - advice in R?
Hi folks,
I have a dataset that consists of counts over a ~30 year period at multiple (>200) sites. Only one count is conducted at each site in each year; however, not all sites are surveyed in all years. I need to impute the missing values because I need an estimate of the total population size (i.e., sum of counts across all sites) in each year as input to another model.
>
2005 Jul 28
1
conversion from SAS
Hi, I wonder if anybody could help me in converting
this easy SAS program into R.
(I'm still trying to do that!)
PROC IMPORT OUT= WORK.CHLA_italian
DATAFILE= "C:\Documents and
Settings\carleal\My
Documents\REBECCA\stat\sas\All&nutrients.xls"
DBMS=EXCEL2000 REPLACE;
GETNAMES=YES;
RUN;
data chla_italian;
set chla_italian;
2007 Mar 30
2
Minimum valid number of observations for rpart
Hi,
I wonder if anyone knows a study dealing with the minimum valid number of
observations when using CART?.
On top of that, when using RandomForest, is it possible to obtained a
interpretable tree model as the graphical output of the analysis, just
like in "rpart"?
Thanks a lot in advance
Javier Lozano
Universidad de Le?n
Spain
2007 Dec 14
2
train nnet
Hi R-helpers,
Can some one tell me how to train 'mynn' of this type?:
mynn <- nnet(y ~ x1 + ..+ x8, data = lgist, size = 2, rang = 0.1,
decay = 5e-4, maxit = 200)
I assume that this nn is untrained, and to train I have to split the
original data into train:test data set,
do leave-one-out refitting to refine the weights (please straighten
this up if I was wrong).
I just don't know
2006 Mar 09
1
bugs in simtest (PR#8670)
# R for Windows will not send your bug report automatically.
# Please copy the bug report (after finishing it) to
# your favorite email program and send it to
#
# r-bugs at r-project.org
#
######################################################
This report is joint from Richard Heiberger <rmh at temple.edu>
and Burt Holland <bholland at temple.edu>.
Burt Holland is the coauthor