[R] Anova

[John Fox]

Dear Jean,

On Fri, 5 Oct 2012 01:27:55 -0700 (PDT)
 Jhope <jeanwaijang at gmail.com> wrote:
> Hi R-listers, 
> 
> I am trying to do an ANOVA for the following scatterplot and received the
> following error:
> 
> library(car)
> scatterplot(HSuccess ~ Veg, 
>             data = data.to.analyze,
>             xlab = "Vegetation border (m)", 
>             ylab = "Hatching success (%)")
> 
> anova(HSuccess ~ Veg, data=data.to.analyze)
> 
> Error in UseMethod("anova") : 
>   no applicable method for 'anova' applied to an object of class "formula"
> 
> I am wondering if there is a better way to do this?

anova() needs a model object, not a formula, as its first argument:

anova(lm(HSuccess ~ Veg, data=data.to.analyze))

Alternatively, you can use aov(), with summary(), to get the ANOVA table:

summary(aov(HSuccess ~ Veg, data=data.to.analyze))

I hope this helps,
 John

------------------------------------------------
John Fox
Sen. William McMaster Prof. of Social Statistics
Department of Sociology
McMaster University
Hamilton, Ontario, Canada
http://socserv.mcmaster.ca/jfox/

> Please advise, Jean
> 
> 
> 
> 
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