install.packages("cowplot", repos='http://cran.us.r-project.org')
install.packages("psych", repos='http://cran.us.r-project.org')
install.packages("PerformanceAnalytics", repos='http://cran.us.r-project.org')
install.packages("stringr", repos='http://cran.us.r-project.org’)
install.packages("dplyr", repos='http://cran.us.r-project.org')
install.packages("gridExtra", repos='http://cran.us.r-project.org')
devtools::install_version("rtweet", version = "0.7.0", repos = "http://cran.us.r-project.org")
install.packages("httpuv", repos='http://cran.us.r-project.org')
devtools::install_github("hadley/emo")
devtools::install_github("gadenbuie/tweetrmd")
devtools::install_github("slowkow/ggrepel")
install.packages("readr", repos='http://cran.us.r-project.org')