Analysis RDA problem


I have two points that I would like to address because it poses a problem for my analysis:

  • The first one being that I want to perform a redundancy analysis (RDA) which is an asymmetric direct constrained analysis and I would like to know if there is a limited number of explicative variables to use? I would like to use 10 variables.
  • The second one is a problem that I encounter on R when I want to perform the RDA and then look at the percentage of variance carried by the axes, an error message is displayed :
    "Error in data.frame(Axis = 1:length(vars3.each), Proportion = vars3.each, :
    arguments imply differing number of rows: 2, 0"
    I have tested and it would come from 2 variables which have no problem in the table...

Thank you for your help !

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