Dear R Help,
I have a set of data of heights of trees described by area that they are in. The areas are numerical (0 to 7).

    ht    area
1   320   3
2   410   4
3   230   2
4   360   3
5   126   1
6   280   2
7   260   2
8   280   2
9   280   2
10  260   2
.......
180 450   4
181  90   1
182 120   1
183 440   4
184 210   2
185 330   3
186 210   2
187 100   1
188   0   0

I want to convert the area column values to factors, to do an anova. However, if I use:

df$areaf <- factor(df$area, labels=c("0","I","II","III","IV","V","VI","VII"))

it gives the following message:

Error in factor(df$area, labels = c("0", "I", "II", "III", "IV", "V", "VI",  : 
        invalid labels; length 8 should be 1 or 7

Can anyone help?

Jabez


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