search for: levene

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....

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.

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 grouping variable (or at least a simple example with this condition). I would like to do a non-para...

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(...

Hi, All! To calculate Levene's Test for Homogeneity of Variance I use R Commander, and this is the output: > levene.test(Dataset$age, Dataset$sex) Levene's Test for Homogeneity of Variance Df F value Pr(>F) group 1 0.8739 0.3567 33 I am not sure what means "Pr(>F)"? Can anyone explain...

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

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...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 and the median of its group (more robust than Levene's original choice, the mean). > > Levene <- function(y, group) > > { > > group <- as.factor(group) # precautionary > > meds <- tapply(y, group, median) > > resp <- abs(y - meds[group]) > > anova(lm(resp ~ group))[1, 4:5] >...

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...

...al 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 couldn't find the LEvene test in R. Is it there? I found the mauchly.test but I wasn't able to find out how to compute the error of covariance matrix I need as an argument for mauchly.test. could anybody help me with the correct input I have to give to Mauchly...

hello, I try to run simulation of levene's test to find the p-value but the error of replacement has length zero occur, could anyone help me to fix this problem? asim <- 1000 pv<-rep(NA,asim) for(i in 1:asim) {print(i) set.seed(i) g1 <- rnorm(20,0,2) g2 <- rnorm(20,0,2) g3 <- rnorm(20,0,2) x <- c(g1,g2,g3) group&lt...

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 [[alternative HTML version deleted]]

Dear All, I am willing to test homogenity of variances using Levene's test. I know how to do it with simple model, but I am lost when dealing with a little bit more complex model. I have response variable (y) and four factors (a, b, c, d). One of these four factors (d) is nested within another factor (c). In addition, I would like to take into account only 2nd...

Dear All, I sent already before a message concerning Levene's test in nested model, but I didn't get any answer. Optimistically I hope to get an answer this time. I also point a new question related to the whole model, because I haven't find any sure answer if I am analysing it in a suitable way or not. I really have tried to do my homework. I...

Hi, What package(s) must I install so that I can apply the Levene' test in my data? I tried 'lawstat' but dependency ?VGAM? is not available for this package. I am using Rstudio Version 1.1.383 Tks [[alternative HTML version deleted]]

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 B...

On Sun, Jan 04, 2015 at 12:14:51PM -0500, Gene Cumm wrote: > On Sun, Jan 4, 2015 at 9:27 AM, gene.cumm at yahoo.com <gene.cumm at yahoo.com> wrote: > > Test from Yahoo via Android > > > > --Gene > > _______________________________________________ > > Syslinux mailing list > > Submissions to Syslinux at zytor.com > > Unsubscribe or set options at:

...ty, I am looking for a robust test for equality of variances that can take observation weights. I realize I can do the F-test with weighted variances, but I've read that this test is not very robust. So I thought about maybe adding a "weights" argument to John Fox's code for the Levene Test (in the "car" library, "levene.test"), substituting his "median" function for a " weighted.mean" and also including the observation weights in his "lm" run-- after all, Levene's original test used the mean, not the median. I asked John abo...

> On Saturday, January 17, 2015 1:48 AM, Geert Stappers <stappers at stappers.nl> wrote: > > > On Sun, Jan 04, 2015 at 07:37:44PM +0100, Geert Stappers wrote: > > On Sun, Jan 04, 2015 at 12:14:51PM -0500, Gene Cumm wrote: >?????????? <snip/> > > > As far as I can tell, GMail does process the SPF/DKIM/DMARC properties > > > but ignores

Hi, It is not important how long I have been moderator for this mailinglist. Thing is that I'm thinking about stepping back. How would like to help the Syslinux project by moderating this ML? Groeten Geert Stappers -- Leven en laten leven ------------- volgend deel ------------ Een niet-tekst bijlage is gescrubt... Naam: signature.asc Type: application/pgp-signature Grootte: 836 bytes