deb http://cran.rstudio.com/bin/linux/debian wheezy-cran3/

apt-cache showpkg r-base-dev

3.0.2-1ubuntu1

Package: *
Pin: origin cran.rstudio.com
Pin-Priority: 900

deb http://cran.rstudio.com/bin/linux/debian jessie-cran3/

sudo gedit /etc/apt/sources.list

deb http://cran.rstudio.com/bin/linux/debian wheezy-cran3/

sudo apt-key adv --keyserver keys.gnupg.net --recv-key 381BA480

sudo apt-get update

apt-cache showpkg r-base-dev

Package: r-base-dev
Versions:
3.2.1-1~wheezycran3.0(/var/lib/apt/lists/cran.rstudio.com_bin_linux_debian_wheezy-cran3_Packages)

sudo apt-get install -f r-base=3.2.1-1~wheezycran3.0