R session information

The R session information when compiling this book is shown below:

## R version 3.5.0 (2017-01-27)
## Platform: x86_64-pc-linux-gnu (64-bit)
## Running under: Ubuntu 14.04.5 LTS
## 
## Locale:
##   LC_CTYPE=en_US.UTF-8      
##   LC_NUMERIC=C              
##   LC_TIME=en_US.UTF-8       
##   LC_COLLATE=en_US.UTF-8    
##   LC_MONETARY=en_US.UTF-8   
##   LC_MESSAGES=en_US.UTF-8   
##   LC_PAPER=en_US.UTF-8      
##   LC_NAME=C                 
##   LC_ADDRESS=C              
##   LC_TELEPHONE=C            
##   LC_MEASUREMENT=en_US.UTF-8
##   LC_IDENTIFICATION=C       
## 
## Package version:
##   bookdown_0.9.2     dplyr_0.8.0.9012  
##   ggplot2_3.1.0.9000 infer_0.4.0       
##   kableExtra_1.1.0   knitr_1.22        
##   readr_1.3.1.9000   rmarkdown_1.12.4  
##   tinytex_0.11      
## 
## Pandoc version: 2.2.1