Dear R users group
I have performed PCA using the function rda in vegan and then used
plot(pcaobject). I have a couple of questions:
1) The default plot shows the individual sites (black) and the variables (red).
What I want however is a plot showing the mean of site groups with
bidirectional error bars displaying the standard deviation for those groups
(with the variables still plotted in the background)...
2) ...I know how to do this by export the scores and loadings to excel and then
using excel or Sigmaplot to do the graphs; however then I have an issue with
the scaling of the loadings (i.e. the values are so small that they are bunched
up at the origin) so here is my second question: Can I multiply the loadings
by a constant to display them in my plot and if yes what is the convention for
doing this.
Many thanks
Paul
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