
495Multivariate Analysis I
14.10.8 corresponDence analysis
There are functions to perform CA in several packages. We will use function ca of package ca and
function cca in package vegan. Thus, please install and load packages ca and vegan if you have
not done this yet or it is not in your Rprole.site le. Recall the function library offers another
way of loading an installed package.
>library(ca);library(vegan)
Also, recall you can add the following segment to your etc/Rprole.site le.
# loading packages automatically copy this in etc/Rprofile.site
local({
old <- getOption(“defaultPackages”)
options(defaultPackages = c(old, “spdep”, “maptools”, ...