[R] re form data for aov()?

[Dieter Menne]

Dan Kelley <kelley.dan <at> gmail.com> writes:

> 
> 
> I have data in a file named hands.dat, which is given at the end of this
> question.  (It's from a stats textbook example on anova).  I'd like to do an
> aov on this, which I guess would be
> 
> d <- read.table("~/hands.dat", header=TRUE)
> 
> aov(Bacterial.Counts ~ Water + Soap + Antibacterial.Soap + Alcohol.Spray,
> data=d)
> 
> Data file (hands.dat)
> ============
> 
> Bacterial.Counts        Method
> 74      Water
> 84      Soap
> 70      Antibacterial.Soap
> 51      Alcohol.Spray

To be sure that data are ok, first try

str(d)

Method should be factor.

aov(BacterialCounts~Method,data=d)

Dieter