2019-07-24 dplyr for programming
2017-06-17 dplyr 0.7.0 with great improvements for programming
2016-11-13 ggplot2: x-axis scale now available on all facet-columns
2016-05-08 RTFM or how to use spread of Hadley Wickham’s tidyr with a factor
2016-02-13 Using geom_ribbon() to visualize a corridor for your data