R help - Feb 2013 - Error Message During ANOVA

Dear R-Help,

I'm using an ANOVA to determine if there is any variation that exists
between my four different shark-types and their entrance behavior towards
an apparatus.

To do this, my coding was:

df1=read.table("lemonentrance.txt", header=TRUE); df1

c(t(as.matrix(df1)))

r = c(t(as.matrix(df1))) # response data

r

f=c("Con","Bro","OEy","Bli")

k=4

n=6

tm=gl(k,1,n*k,factor(f))

tm

av=aov(r~tm)

Error in model.frame.default(formula = r ~ tm, drop.unused.levels = TRUE) :
  variable lengths differ (found for 'tm')

summary(av)

Error in summary(av) : object 'av' not found

As you can see, I receive two error message, with teh second being a cause
of the first.  Does anybody have any idea how I can fix this, or at least
would you happen to know what the error is referring to?

Thanks and a response would be greatly appreciated.

Kind Regards,

Craig



-- 
<><  <><  <><
Craig O'Connell
University of Massachusetts Dartmouth
Marine Biologist
www.youtube.com/craigpoconnell
craigosea.blogspot.com

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Hello,

The first error message says:

 > Error in model.frame.default(formula = r ~ tm, drop.unused.levels = 
TRUE) : variable lengths differ (found for 'tm')

Please compare the size of 'r' and 'tm'.

Regards,
Pascal

Le 14/02/2013 07:14, Craig O'Connell a ?crit :
> Dear R-Help,
>
> I'm using an ANOVA to determine if there is any variation that exists
> between my four different shark-types and their entrance behavior towards
> an apparatus.
>
> To do this, my coding was:
>
> df1=read.table("lemonentrance.txt", header=TRUE); df1
>
> c(t(as.matrix(df1)))
>
> r = c(t(as.matrix(df1))) # response data
>
> r
>
> f=c("Con","Bro","OEy","Bli")
>
> k=4
>
> n=6
>
> tm=gl(k,1,n*k,factor(f))
>
> tm
>
> av=aov(r~tm)
>
> Error in model.frame.default(formula = r ~ tm, drop.unused.levels = TRUE) :
>    variable lengths differ (found for 'tm')
>
> summary(av)
>
> Error in summary(av) : object 'av' not found
>
> As you can see, I receive two error message, with teh second being a cause
> of the first.  Does anybody have any idea how I can fix this, or at least
> would you happen to know what the error is referring to?
>
> Thanks and a response would be greatly appreciated.
>
> Kind Regards,
>
> Craig
>
>
>