Hello, I am a new R user. I am currently trying to install packages on my mac (macOS Mojave).
install.packages("class")
Warning in install.packages :
unable to access index for repository http://stat.ethz.ch/CRAN/src/contrib:
cannot open URL 'http://stat.ethz.ch/CRAN/src/contrib/PACKAGES'
package ‘class’ is not available (for R version 3.5.2)
Can anyone help me with this issue. Thanks in advance
Choose another repository, generally the closer geographically the better.
In RStudio: Tools | Global Options | Packages | CRAN mirror | Change
A list of repos is at https://cran.r-project.org/mirrors.html
In R console Preferences | Startup | Default Cran Mirror
Try with Rstudio's CRAN repository
install.packages('class', repos='http://cran.rstudio.com/')
If you still get this error message, check if your internet connection is behind a proxy server or firewall.
many thanks for your help. it worked. 
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