Load the new marks files. Modify all course functions to reflect the new file layout. Update cohort building for course results, and update models to reflect credit information.
Add name to unnamed chunk.
Remove analysis of change in classifications because it may be misleading.
Clean up willrepeatgr missingness.
Calculate age when starting 10th grade.
10GM out of sample predictions.
Updated prose throughout.
Clean up assignment operator.
Clean up course failures.
Clean up HS assignment based on current school configurations.
Add step-wise model info commented out for posterity.