In a CCA ordination, is there a way to enter some samples passively so as to see where they fall out in a pre-existing ordination?
A. PC-ORD doesn’t have an automatic way of doing this, but you can easily do it with a spreadsheet. Plug in the values for the environmental variables into the multiple regression equation. If you use the raw environmental variables, be sure to use the unstandardized regression coefficients. If you express the environmental variables as standard deviates from the mean of the original data set, then you can use the standardized regression coefficients.
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