Hello All,
I’m Julia from Germany and I have a problem concerning the vegan package that I
can’t solve on my own (after hours and hours spent searching for a solution). I
was thrown into the topic of working with R by my professor and wasn’t really
aware that this included working with higher statistics (since I studied
pedagogy before and have not much basic statistical knowledge or knowledge of
R).
I need to do a correspondence analysis on a dataset of vegetation samples and
species as a comma-separated csv file. I have the species names as row names.
The column names indicated zonation + land use and make up the first row of the
matrix. I set the header = TRUE.
If I tried doing a CA or DCA with this dataset the warning “Error in
rowSums(X): ‘x’ must be numeric” appeared. According to several forums, I then
removed the first column and the CA worked and i could also apply the envfit
function and plot it.
Now here comes my problem and question:
when I plotted the arrows { plot(ef, p.max = 0.1) }, I got arrows labeled with
species in my ordination plot. But instead I would need the column that
indicates the zonation/land use (the first column) which I had to remove in
order for the CA/ DCA to work. Is there any way that I can incorporate the
zonation/ land use column as environmental vector after I did the whole CA/
DCA? Or is there any way for me to do a CA/ DCA without having to remove the
first column?
I might be missing something but I just started working with R and haven’t got
the time to really work my way in from the basics. I will do that after this
project is done but for now I just hope that you can help me.
Greetings,
Julia
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