Full_Name: AJ Rossini Version: 2.2.0 OS: Unix Submission from: (NULL) (160.62.4.10) new.packages() reports on packages which are installed as well as not installed, for packages installed using install.packages() and the argument installWithVers=TRUE This contrasts with reporting only on uninstalled packages (correct behavior) for packages installed using install.packages() and the argument installWithVers=FALSE. i.e. install.packages(new.packages(),installWithVers=TRUE) run again and again will keep installing the same packages. install.packages(new.packages()) run again and again will only install the packages once.