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Why can't I install Zelig?

You must be connected to the internet to install packages from web depositories. In addition, there are a few platform-specific reasons why you may have installation problems:

• On Windows: If you are using the very latest version of R, you may not be able to install Zelig until we update Zelig to work on the latest release of R. If you wish to install Zelig in the interim, check the Zelig release notes (Section ) and download the appropriate version of R to work with the last release of Zelig. You may have to manually download and install Zelig.

• On Mac: If the latest version of Zelig is not yet available at CRAN but you would like to install it on your Mac, try typing the following at your R prompt:

     install.packages("Zelig", repos = "http://gking.harvard.edu", type = "source")
  

• On Mac or Linux systems: If you get the following warning message at the end of your installation:

  Installation of package VGAM had non-zero exit status in ...
  

  this means that you were not able to install VGAM properly. Make sure that you have the g77 Fortran compiler. For PowerPC Macs, download g77 from http://hpc.sourceforge.net). For Intel Macs, download the xcode Apple developer tools. After installation, try to install Zelig again.