Install R on macOS

This instruction covers the steps required to install R on macOS.

I
install-r-macOS-1-msahebhonar.com
II
install-r-macOS-2-msahebhonar.com
III
install-r-macOS-3-msahebhonar.com
IV
install-r-macOS-4-msahebhonar.com
V
install-r-macOS-5-msahebhonar.com
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install-r-macOS-6-msahebhonar.com
VII
install-r-macOS-7-msahebhonar.com
VIII
install-r-macOS-8-msahebhonar.com
IX
install-r-macOS-9-msahebhonar.com