Problem Roulette Caliper data with NVD3

Data: an anonymized selection of Caliper events, simplified with JQ with a command.

Bar charts
Users: attempts, corrects, incorrects, time spent on problems
Sets: attempts, % corrects, % incorrects
Courses: attempts per course
Pie chart
Sets: % attempts per set
Scatter Plot
Attempts: correct and incorrect
Stacked Bars
Users: correct and incorrect, stacked or grouped, some primitive sorting
Time Chart
Usage: attempts by time
Looking at a student's track through app
Events:Items Completed(successfully/unsuccessfully)/Skipped
Looking at a student's track through app (bar chart)
Events:Items Completed(successfully/unsuccessfully)/Skipped
Data includes all events
Events:all events, all events grouped by class