What tools are in your data science tool kit? Let's build a classifier! Here's the data set we're going to work with: http://groupware.les.inf.puc-rio.br/har Goal: Develop, test, and document a classifier to predict the "class" column of the data set. Please hold out a random 10% for an out-of-sample validation. Don't peek! Bonus Points: R markdown (http://rmarkdown.rstudio.com/) dplyr (http://cran.rstudio.com/web/packages/dplyr/vignettes/introduction.html) caret (http://topepo.github.io/caret/index.html) Spark (https://spark.apache.org/mllib/) When you've got an awesome classifier, raise a pull request!