1step,rule,n_before,n_after,n_removed,rationale21,drop 1995Q1 (infl_annualised undefined),127,126,1,first difference unavailable32,drop first 4 inflation obs used only as initial lags (common AIC sample with p_max=4) - last-origin estimation sample ends 2025-07-01; quarters after last origin used only as targets,126,118,8,initial lags (4) and post-origin quarters 2025Q4-2026Q3 (4) not in final estimation sample4