devtools::install_github("quanteda/quanteda.textmodels") 
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')