[R] Sorting data from one column with strings
A.Eigenhuis at uva.nl
Thu Nov 4 14:27:54 CET 2010
For the Nitrogen column, the mean is calculated for each Species. (if the data frame below is in the object data)
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf Of Ramsvatn Silje
Sent: donderdag 4 november 2010 13:28
To: R-help at r-project.org
Subject: [R] Sorting data from one column with strings
I have tried to find this out some other way, but unsuccessful I have to try this list.
I assume this should be quite simple.
I have a dataset with 4 columns, "Sample_no", "Species", "Nitrogen", "Carbon" in csv format. In the species column I have many different species with varying number of obs per species
"Sample_no" "Species" "Nitrogen" "Carbon"
1 Cod 15.2 -19.0
2 Haddock 14.8 -20.2
3 Cod 15.6 -18.5
4 Cod 13.2 -20.1
5 Haddock 14.3 -18.8
And I want to calculate, mean, standard dev etc per species for the observations "Nitrogen" and "Carbon". And later do plots and stats with the different species. I will in the end have many species, so need it to be "automatic" I can't enter code for every species separate.
Can anyone help me with this? Or if this is the wrong list to sendt this question to, where do I send it?
Thank you very much in advance.
University of Tromsø
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