This is part of my program. I am getting an error, that I cannot figure out,
any help would very much appreciated, thanks.
# subset variables
arc <- arc[,c("SNAP", "code", "ncode", "var", "n_total")]
Error in `[.data.frame`(arc, , c("SNAP", "code", "ncode", :
undefined columns selected
arc$N_eff <- with(arc, ifelse(var > 1, n_total, var * n_total))
Error in storage.mode(test) <- "logical" : object 'var' not found
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