Displaying 20 results from an estimated 3000 matches similar to: "About levene.test"
2018 Jan 15
0
About levene.test
Dear Mariano,
See the function leveneTest() in the car package.
I hope that this helps,
John
-----------------------------
John Fox, Professor Emeritus
McMaster University
Hamilton, Ontario, Canada
Web: socialsciences.mcmaster.ca/jfox/
> -----Original Message-----
> From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of Marcelo
> Mariano Silva
> Sent: Monday, January
2010 Feb 15
1
Difference in Levene's test between R and SPSS
Hello,
I notice that when I do Levene's test to test equality of variances across
levels of a factor, I get different answers in R and SPSS 16.
e.g.: For the chickwts data, in R, levene.test(weight, feed) gives
F=0.7493, p=0.5896.
SPSS 16 gives F=0.987, p=0.432
Why this difference? Which one should I believe? (I would like to believe
R :)
Ravi
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2018 May 10
2
using for loop with data frames.
Hi,
Is it possible use a loop to process many data frames in the same way?
For example, if I have three data frames, all with same variables
df_bs_id1 <- read.csv("test1.csv",header =TRUE)
df_bs_id2 <- read.csv("test2.csv",header =TRUE)
df_bs_id3 <- read.csv("test3.csv",header =TRUE)
How could I would implement a code loop that , for instance, would
2018 May 10
3
Fill down a new column in data frame with a number
Hi,
I am a begginer in R programming.
I am traying to create a a column in my data frame filled down with a
number.
> df$newcolumn <- number
How can I do it? I am considering use rep() but in this case it is
necessary know the number of rows in each data base that I have and I would
like to do it in a faster ( and more elegant) way.
TKs
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2010 Jul 14
3
levene.test
I am trying to use Levene's test (of package car), but I do
not understand quite well how to use it. '?levene.test' does
not unfortunately provide any example. My data are in a data
frame and correspond to 1 factor plus response. Could
someone please give me an example about how to use the command
levene.test(y, group)
Thanks in advance,
marta
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2011 Jun 10
2
Problem loading packages in R 2.13.0 on Mac
I am having problem loading packages in the newest version of R
(2.13.0) on my Mac. I have tried to install various packages (e.g.
lawstat, Rcmdr, car) and load them using the Package Installer and
Package Manager menu options but I get the follow error:
> library(lawstat)
Loading required package: mvtnorm
Error: package 'mvtnorm' could not be loaded
In addition: Warning
2007 Jul 05
4
Levene Test with R
Hi All,
is there Levene' test in R ? If not ,Could you give me some
advice about Levene test with R?
Thanks a lot! I am waiting for yours.
2006 Jun 27
2
Mauchly and Levene
Hallo!
I just started working with R to do the statistical analyses for my diploma thesis.
I got two sets of data.
Both contain repeated measures.
One has only one within-subject factor with four levels.
The other has one within-subject factor with two levels and one between-factor with two levels.
I want to compute a Mauchly test for both sets and a Levene test for the second set.
I
2008 Feb 14
5
Levene's test for homogeneity of variances (befor using ANOVA)
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2003 Aug 13
4
Levene test of homogeneity of variance
Has the Levene test of homogeneity of variance been implemented in any
library in R?
Thanks,
Maurice Haynes
National Institute of Child Health and Human Development
Child and Family Research Section
6705 Rockledge Drive
Bethesda, MD 20892
Voice: 301-496-8180
Fax: 301-496-2766
E-Mail: mh192j at nih.gov
2011 Nov 16
0
ANOVA on residuals to check for equality of variances
Hi all,
I know that I can run an one way ANOVA on the absolute residual values
to check the assumption of equal variances:
model<- lm(y~x)
summary(lm(abs(model$resid~x)))
What if I have two factors? As far as I know I have to check this
assumption on very factor/level combination. So if I have 3 factors with
three levels, I would have to test 9 factor/level combinations. Here
comes my
2003 Nov 29
1
Classic Levene Test of variances
Hello,
I am searching for the classic Levene test of variances in R but I don't find the function. Is there any command or do I have to programm the test by myself? Does anybody know? Help would be fine because R is very new to me.
S.Zank
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2012 Jan 10
1
S4 summary method not being called (VGAM)
The symptom triggering this email is that an S4 summary method sometimes refuses to be invoked, even when a package is explicitly loaded, if the first load of the package is implicit. It may or may not be specific to 'summary' methods and/or the 'VGAM' package. I've sent to R-devel because (i) it looks like some kind of bug to me, but I'm not sure; (ii) it's not
2007 Feb 20
1
bootstrapping Levene's test
Hello all,
I am low down on the learning curve of R but so far I have had little
trouble using most of the packages. However, recently I have run into
a wall when it comes to bootstrapping a Levene's test (from the car
package) and thought you might be able to help. I have not been able
to find R examples for the "boot" package where the test statistic
specifically uses a
2006 Aug 02
1
Syntax of Levene's test
Dear All
I am trying to use Levene's test (of package car), but I do not
understand quite well how to use it. '?levene.test' does not
unfortunately provide any example. My data are in a data frame and
correspond to 4 factors plus response. Could someone please give me an
example about how to use the command
levene.test(y, group)
?
Thanks in advance,
Paul
2002 Jun 28
1
windres problem
Hello,
I am trying to build an R package for Windows from an R package
for Linux. There seems to be a "windres" problem somewhere.
Here's what I get.
C:\Temp>Rcmd build --binary VGAM > mm
make[2]: windres: Command not found
make[2]: *** [VGAM_res.o] Error 127
make[1]: *** [src/VGAM.dll] Error 2
make: *** [pkg-VGAM] Error 2
In more details, it goes like the following.
2005 May 28
3
Incompatibility with VGAM
I just discovered that when the VGAM package (not on CRAN) is loaded,
glm() doesn't work. This is because VGAM defines a family function()
which gets found
by glm() in place of the family function from stats.
Then VGAM:::family returns an object which doesn't have a $family
component, (it has a component
$vfamily).
I thought namespaces should protect us from this happening?
Kjetil
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2010 Feb 17
1
Error while installing 'netmodels'
Dear all ,
I am trying to install a package by name 'netmodels' keep
on getting the following error :
> install.packages("netmodels")
Warning in install.packages("netmodels") :
argument 'lib' is missing: using '/usr/lib64/R/library'
also installing the dependency ‘VGAM’
trying URL
2008 Apr 18
2
rzinb (VGAM) and dnbinom in optim
Dear R-help gurus (and T.Yee, the VGAM maintainer) -
I've been banging my head against the keyboard for too long now, hopefully someone can pick up on the errors of my ways...
I am trying to use optim to fit a zero-inflated negative binomial distribution. No matter what I try I can't get optim to recognize my initial parameters. I think the problem is that dnbinom allows either
2000 Sep 01
1
Levene's test
> From: Peter Dalgaard BSA <p.dalgaard at biostat.ku.dk>
> Date: 01 Sep 2000 09:54:59 +0200
>
> Prof Brian D Ripley <ripley at stats.ox.ac.uk> writes:
Important omission: specification from Murray Jorgensen
The test that I was thinking of basically does an anova on a modified
response variable that is the absolute value of the difference between an
observation