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All functions

rt_data()
Assemble two-attempt repeater data
rt_evidence()
Evidence statistics for each repeater
rt_fit()
Fit the expected-gain model
rt_raw_gain()
Raw-gain flagging (the common practice, as a baseline)
rt_risk()
Calibrated risk index for repeat test-takers
rt_simulate()
Simulate repeat test-takers with known misconduct