| apm_est | Estimate ATTs from models fits | 
| apm_mod | Generate models used to fit outcomes | 
| apm_pre | Fit validation models to pre-treatment data | 
| plot.apm_est | Estimate ATTs from models fits | 
| plot.apm_pre_fits | Plot outputs of 'apm_pre()' | 
| ptpdata | Dataset on Annual Homicide Rates | 
| robustness_bound | Compute the robustness changepoint | 
| summary.apm_est | Estimate ATTs from models fits | 
| summary.apm_pre_fits | Fit validation models to pre-treatment data |