
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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