MITx and HarvardX course data

-mitx.Rmd

`> sort( round(sapply( split( HX, HX$course_id ), function(x) sum(x$viewed) / sum(x$registered) *100  )), decreasing=T)`
                                 Programming 
                                          77 
                      Mechanical Engineering 
                                          71 
                      Structural Engineering 
                                          68 
                                         E&M 
                                          67 
                            Computer Science 
                                          63 
                       Solid State Chemistry 
                                          63 
                                     Biology 
                                          62 
                                     Poverty 
                                          59 
                      Circuits & Electronics 
                                          58 
                           Health in Numbers 
                                          58 
                                     Justice 
                                          56 
                                    Classics 
                                          54 
Human Health and Global Environmental Change 
                                          38 
`> sort( round(sapply( split( HX, HX$course_id ), function(x) sum(x$explored) / sum(x$registered) *100  )), decreasing=T)`
                                     Poverty 
                                          11 
                           Health in Numbers 
                                          10 
                      Structural Engineering 
                                          10 
                                     Biology 
                                           7 
                      Circuits & Electronics 
                                           6 
                            Computer Science 
                                           6 
                                         E&M 
                                           6 
                                     Justice 
                                           6 
                                 Programming 
                                           6 
                       Solid State Chemistry 
                                           5 
                      Mechanical Engineering 
                                           4 
Human Health and Global Environmental Change 
                                           3 
                                    Classics 
                                           2