A CRAN mirror is a server that hosts copies of the Comprehensive R Archive Network's repository. These mirrors are distributed globally to provide faster access and reliability when downloading R packages.
How to Choose a CRAN Mirror:
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Select a Nearby Mirror: Choose one geographically close to you for faster download speeds. https://cran.r-project.org/mirrors.html Mirror status available at https://cran.r-project.org/mirmon_report.html.
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options(repos = "https://cran.stat.auckland.ac.nz/") -
Or use RStudio: Go to Tools > Global Options > Packages. Click Change to select a mirror.