1step,rule,n_before,n_after,n_removed,rationale21,drop quarters with missing infl_annualised,127,126,1,"1995Q1 has no previous quarter, so its inflation is undefined"32,last estimation sample: quarters <= last origin 2025-07-01,126,122,4,information rule: forecasts at origin t use only quarters <= t; later quarters serve only as targets4