I'm a beginner, trying to do a canonical correspondance analysis with the vegan package, but I come up with that : > library(vegan) > abondance.txt <- read.table("C:/Users/abondance.txt",header=T,sep="\t") > abondance <- cca(abondance[,-c(1,2)]~altitude, data=abondance, nhea) Error in model.frame(data = abondance, na.action = function (object,  :   object 'abondance' not found any ideas ? thanks !  		 	   		  
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