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Questions tagged [r-car]

car (an R package) means Companion to Applied Regression. Use with the [r] tag

86 questions
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R Variance Inflation Factors - Warning : No function found corresponding to methods exports from ‘SparseM’ for: ‘coerce’

I am playing around with the car library for R and have encountered the following warning after calling the variance_inflation_factors function on my data model. No function found corresponding to methods exports from ‘SparseM’ for: …
FinnM
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Recode in Car package returns unexpected symbol when recoding strings

I have run into a recurring issue when using the car package recode function. If I recreate a publicly used example (http://susanejohnston.wordpress.com/2012/07/18/find-and-replace-in-r-part-1-recode-in-the-library-car/) and do: y <-…
MattT
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xtable for MANOVA object obtained with car package

I wonder how to get xtable of MANOVA object obtained with car package. Here is MWE: library(xtable) library(car) MANOVA <- Anova(lm(cbind(Al, Fe, Mg, Ca, Na) ~ Site, data=Pottery)) xtable(MANOVA) Error in UseMethod("xtable") : no applicable…
MYaseen208
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R: Error in vif.default(m) : model contains fewer than 2 terms

When I fit a polynomial regression model in R, if I use the function poly() and then try to get the variance inflation factors using vif() I get the following error: y = c(0.22200,0.39500,0.42200,0.43700,0.42800,0.46700,0.44400,0.37800,0.49400, …
s5s
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Looking for a post hoc for a type 2 Anova (mixed-effects model)

My question is how do I run a post hoc on a type 2 Anova (mixed-effects model)? So far I am using the glmer() from the "lme4" package, the Anova() from the "car" package, and trying to run a HSD test from the "agricolae" package. After searching…
Maria
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Combining scatterplots

I am trying to combine multiple (four) scatter plots into one figure (but not a scatterplot matrix). I am making the individual scatter plots with the scatterplot() function of the car package. I used to be able to combine the four plots using…
Pseudotriton
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R: customised function for VIF

I am trying to write a loop to calculate Variance Inflation Factor. I understand there are functions and packages that can do this for me but I need some sort of customisation. A sample data library(MASS) library(clusterGeneration) …
89_Simple
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R car package - extract residuals for 2 way anova with repeated factors

I am using the car package to do a two way anova with repeated measures in R. More specifically I'm using the function Anova() (note the capital A). This seems to be working fine but I want to test if the residuals are normal. However, I can't find…
JaneDoe
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scatter3d ellipsoid argument inside shiny R failing

Two steps forward, one step back. The last weeks I've run into a few issues that I could not solve on my own as a self tought user with 1 year experience in R, but fortunatly there are great people on this site that have helped me a lot! First of…
Mark
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Ugly overlapping line (abline) in scatterplot

I have this problem with an ugly looking overlapping regression line when I plot my calculations with scatterplot() in combination with abline(): The bug seems to occur only when the line is cutting the upper frame. Unfortunately it happens with my…
jay.sf
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Using car::Anova package for a doubly-multivariate MANOVA in R

I'm trying to run a repeated-measures MANOVA in R, which also contains a number of dependent variables (key outcome variables of behavioural tasks). The repeated-measures are due to a cross-over design, in which individuals took a drug and placebo…
A.Pike
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Calculating Variance Inflation Factors (VIFs) based on object type in R

There seem to be two popular ways of calculating VIFs (Variance Inflation Factors, to detect collinearity among variables in regression) in R: The vif() function in the car package, where the input is the model. This requires you to first fit a…
Tilen
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Fitting Binomial distribution with car package

For fitting several probability distribution for my data set, I try several distributions using car and MASS packages, for example for Poisson distribution: require(car); require (MASS) #Data set X1 <- rnorm(100, 175, 7) Y1 <- rbinom(100,1,…
Leprechault
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how to add x=y line to scatterplot matrix?

I would like to add an x=y-line to the scatterplots of a scatterplotmatrix like the one below: Does anyone know a function which is able to do this with an easy option? so far I tried pairs and here scatterplotMatrix from car-package and couldn´t…
WeTo
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Weird behaviour of the car::boxCox() function when wrap into a homemade function

I'm trying to wrap the car::boxCox function into a homemade function so I can mapply it to a list of datasets. I'm using the boxCox function from the car package and not the MASS package because I want to use the family="yjPower". My problem is…
Bastien
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