You've spotted it!
table(df$area)
0 1 2 3 4 5 7
21 27 71 46 19 3 1
There are no values in area 6.
Thank you very much.
Jabez
- Original Message
From: Petr PIKAL <[EMAIL PROTECTED]>
To: Jabez Wilson <[EMAIL PROTECTED]>
Cc: R-Help
Sent: Friday, 10 August, 2007 1:02:21 PM
Subject: Odp: [R] having problems with factor()
Hi
[EMAIL PROTECTED] napsal dne 10.08.2007 13:41:53:
> Dear R Help,
> I have a set of data of heights of trees described by area that they are
in.
> The areas are numerical (0 to 7).
>
> htarea
> 1 320 3
> 2 410 4
> 3 230 2
> 4 360 3
> 5 126 1
> 6 280 2
> 7 260 2
> 8 280 2
> 9 280 2
> 10 260 2
> ...
> 180 450 4
> 181 90 1
> 182 120 1
> 183 440 4
> 184 210 2
> 185 330 3
> 186 210 2
> 187 100 1
> 188 0 0
>
> I want to convert the area column values to factors, to do an anova.
However, if I use:
>
> df$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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