?aggregate
> y
year site rep rain
1 1980 1 1 2.6550866
7 1980 1 2 3.7212390
13 1980 1 3 5.7285336
4 1980 2 1 9.0820779
10 1980 2 2 2.0168193
16 1980 2 3 8.9838968
2 1981 1 1 9.4467527
8 1981 1 2 6.6079779
14 1981 1 3 6.2911404
5 1981 2 1 0.6178627
11 1981 2 2 2.0597457
17 1981 2 3 1.7655675
3 1982 1 1 6.8702285
9 1982 1 2 3.8410372
15 1982 1 3 7.6984142
6 1982 2 1 4.9769924
12 1982 2 2 7.1761851
18 1982 2 3 9.9190609> aggregate(y, list(y$year, y$site), mean)
Group.1 Group.2 year site rep rain
1 1980 1 1980 1 2 4.034953
2 1981 1 1981 1 2 7.448624
3 1982 1 1982 1 2 6.136560
4 1980 2 1980 2 2 6.694265
5 1981 2 1981 2 2 1.481059
6 1982 2 1982 2 2 7.357413>
On 5/30/06, Milton Cezar <miltinho_astronauta@yahoo.com.br>
wrote:>
> Hi there,
> I´m a newbie in R and I´m looking for some advice how to teste Piecewise
> (Broken Stick) models.
>
> I´have another simple question: how can I compute descriptive statistics
> for data grouped for two or more variables? See below, please.
>
> Year Site Repetition rainfall
> 1980 1 1 ...
> 1980 1 2 ...
> 1980 1 3 ...
> 1980 2 1 ...
> 1980 2 2 ...
> 1980 2 3 ...
>
> 1990 1 1 ...
> 1990 1 2 ...
> 1990 1 3 ...
> 1990 2 1 ...
> 1990 2 2 ...
> 1990 2 3 ...
>
> I´d like to compute the mean rainfall for each YEAR * SITE combination.
>
> Kind regards,
>
> Miltinho
>
>
> ---------------------------------
>
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>
>
>
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>
--
Jim Holtman
Cincinnati, OH
+1 513 646 9390 (Cell)
+1 513 247 0281 (Home)
What is the problem you are trying to solve?
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