nonabsdid - Visualize Heterogeneity-Robust Event Studies for Non-Absorbing Treatments

Runs several heterogeneity-robust difference-in-differences (DID) event-study estimators for non-absorbing (i.e., treatment can switch on and off) binary treatments through their own packages, harmonizes their output onto a common time axis and tidy data structure, and overlays them in a single 'ggplot2' panel for visual comparison. Supported estimators include those provided by 'DIDmultiplegtDYN', 'PanelMatch', and 'fect', with an optional naive two-way fixed-effects reference series via 'fixest'. A single 'nabs_event_study()' wrapper runs any supported estimator with a common interface; 'nabs_event_study_simple()' provides a one-line front door for quick exploratory runs; the S3 generic 'as_nabs_event_study()' coerces estimator output into a tidy tibble with a stable schema; and 'nabs_event_plot()' overlays multiple methods on a single 'ggplot2' panel, with optional naive two-way fixed effects drawn in a neutral color as a reference.