install.packages("psych", repos='http://cran.us.r-project.org')
install.packages("PerformanceAnalytics", repos='http://cran.us.r-project.org')
install.packages("dplyr", repos='http://cran.us.r-project.org')
install.packages("maps", repos='http://cran.us.r-project.org')
install.packages("leaflet", repos='http://cran.us.r-project.org')
install.packages("rtweet", repos='http://cran.us.r-project.org')
install.packages("httpuv", repos='http://cran.us.r-project.org')
install.packages("manifestoR", repos='http://cran.us.r-project.org')
install.packages("ggmap", repos='http://cran.us.r-project.org')