Here is the recommended location to store package data in a R package. Please read the following for more information: http://r-pkgs.had.co.nz/data.html.
Note, it is recommended that EcoSML packages use a /inst/resources directory instead of /inst/data.
To load a data file from this directory, run the following in R.
From a function inside the package:
system.file("resources", "sample.csv", package=packageName())
Load package data from outside the package
system.file("resources", "sample.csv", package="[[packageName]]")
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