R help - Aug 2007 - Odp: having problems with factor()

You've spotted it!

table(df$area)
 0  1  2  3  4  5  7 
21 27 71 46 19  3  1 
 
There are no values in area 6.

Thank you very much.

Jabez


----- Original Message ----
From: Petr PIKAL <petr.pikal@precheza.cz>
To: Jabez Wilson <jabezwuk@yahoo.co.uk>
Cc: R-Help <r-help@stat.math.ethz.ch>
Sent: Friday, 10 August, 2007 1:02:21 PM
Subject: Odp: [R] having problems with factor()


Hi
r-help-bounces@stat.math.ethz.ch napsal dne 10.08.2007 13:41:53:
> 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:
> 
Hm, maybe some of the values are missing
> num<-sample(1:3, 10, replace=T)
> num
[1] 1 3 1 2 3 3 1 3 3 3
> factor(num, labels=c("O", "I", "II"))
[1] O  II O  I  II II O  II II II
Levels: O I II
> factor(num, labels=c("O", "I", "II",
"III"))
Error in factor(num, labels = c("O", "I", "II",
"III")) :
        invalid labels; length 4 should be 1 or 3
>
try

table(df$area)
to see what level you really have

Regards
Petr

> 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
> 
> 
>       ___________________________________________________________
> 
> now.
> 
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> 
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      ___________________________________________________________

now.

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