In Canoco 4.5 you could treat nominal variables in a separate way from numerical variables by having each category of a nominal variable assigned a separate column in the environmental data file and then assigning these nominal variables within the programme of Canodraw the status of 'nominal variables'. In Canoco 5.0 I cannot find this function any more and nominal variables are drawn by means of arrows just like all the other variables.
Craig Morris
In Canco 5, you can have all levels coded as text in a single nominal variable. If you specify this variable as a factor when reading in the data, Canoco 5 will parse the variable into its respective levels. Much easier than in older versions.
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