https://cran.r-project.org/web/packages/betareg/index.html
CRAN: Package betareg
Beta regression for modeling beta-distributed dependent variables on the open unit interval (0, 1), e.g., rates and proportions, see Cribari-Neto and Zeileis...
cranpackage
https://www.r-project.org/nosvn/R.check/r-oldrel-macos-x86_64/betareg-00check.html
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