[R] ANOVA from imported data has only 1 degree of freedom

[David Winsemius]

On Oct 9, 2011, at 11:10 AM, shardman wrote:

> Hi,
>
> I'm trying to analyse some data I have imported into R from a .csv  
> file but
> when I carry out the aov command the results show only one degree of  
> freedom
> when there should be 14. Does anyone know why? I'd really appreciate  
> some
> help, the data is pasted below.
>

To me this appears likely to be homework. If so then please read your  
college's rules regarding  academic honesty. In any case, please read  
the Posting Guide.

>
> /The imported table looks ike this this:/
>
>        Order Transect Sample Abundance
> 1  Coleoptera        1      1        13
> 2  Coleoptera        1      2        12
> 3  Coleoptera        1      3        11
> 4  Coleoptera        1      4        13
> 5  Coleoptera        1      5         6
> 6  Coleoptera        2      1        18
> 7  Coleoptera        2      2        18
> 8  Coleoptera        2      3        16
> 9  Coleoptera        2      4        21
> 10 Coleoptera        2      5        11
> 11 Coleoptera        3      1        19
> 12 Coleoptera        3      2        16
> 13 Coleoptera        3      3         9
> 14 Coleoptera        3      4        32
> 15 Coleoptera        3      5        29
>
> /The command I am using is this:/
>
> anova2<-aov(Abundance~Transect,data=beetle)
>
> /The results come out like this:/
>
> Df Sum Sq Mean Sq F value  Pr(>F)
> Transect     1 250.00 250.000  7.2394 0.01852 *
> Residuals   13 448.93  34.533
> ---
> Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1
>
> Cheers,
> Sam
>
>
> --
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>
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David Winsemius, MD
West Hartford, CT