install.packages("topicomodels", repos='http://cran.us.r-project.org') install.packages("ldatuning", repos='http://cran.us.r-project.org') install.packages("lubridate", repos='http://cran.us.r-project.org') install.packages("topicdoc", repos='http://cran.us.r-project.org') install.packages("tidytext", repos='http://cran.us.r-project.org')