The MASS package is listed on the CRAN web site (
http://cran.r-project.org/web/packages/MASS/index.html) but I am unable to
install it via install.packages(). The error is that the package is
"unavailable". When I manually download the source tar ball and try to
install it on a Linux machine, installation fails because "it is not a valid
package".

Do I need to search different repositories ?
Thanks,
Markus

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