int_lap_corner_drift

Item 02h.

Part of the Residual family.

Item 02h. int_corner_drift_from_early_stint aggregated from (lap x corner) grain to lap grain — the same mean/sd/max-per-phase shape int_lap_corner_inputs (02c) uses, applied to DRIFT instead of PACE. One row per race lap that has at least one corner row in the upstream model. COVERAGE IS TWO CONFOUNDS AT ONCE, named so it is not mistaken for one. A lap’s drift can be NULL because its own corner telemetry / field baseline is unmapped (02c’s confound), OR because the lap sits inside the baseline window or its stint is shorter than 7 valid laps (a new, purely mechanical confound: a function of lap_in_stint / age_in_stint, both already in the 32-column contract). corner_drift_coverage is admitted as its own column, same reasoning as 02c’s corner_input_coverage, and ablated separately as this item’s arm C.

Lineage

Overview

Property	Value
Layer	intermediate
Family	Residual
Contract enforced	No
Tags	feature_engineering
Upstream	int_corner_drift_from_early_stint

8 tests guard this model - 8 generic, 0 singular.

Columns

Column	Type	Nullable	Tests	Description
lap_id		Yes	not_null, unique	PK, FK to stg_laps.
corners_total_n		Yes	not_null	Corners the lineage placed on this lap.
corners_drift_mapped_n		Yes	not_null	Corners on this lap with at least one non-NULL phase drift value.
corner_drift_coverage		Yes	not_null	corners_drift_mapped_n / corners_total_n. The contract column — see model description.
corner_braking_drift_n		Yes	not_null	Corners on this lap with a measured braking drift. Companion column, not a feature.
corner_mid_drift_n		Yes	not_null	Corners on this lap with a measured mid-corner drift. Companion column, not a feature.
corner_exit_drift_n		Yes	not_null	Corners on this lap with a measured exit drift. Companion column, not a feature.
corner_braking_drift_mean_s		Yes		Mean braking_drift_s across the lap’s corners. Positive = braking has drifted earlier (worse) than the driver’s own early-stint baseline.
corner_braking_drift_sd_s		Yes		Sample sd of braking_drift_s across the lap’s corners.
corner_braking_drift_max_s		Yes		Largest braking_drift_s on the lap.
corner_mid_drift_mean_s		Yes		Mean mid_drift_s across the lap’s corners. Positive = apex speed has drifted down from the driver’s own early-stint baseline.
corner_mid_drift_sd_s		Yes		Sample sd of mid_drift_s across the lap’s corners.
corner_mid_drift_max_s		Yes		Largest mid_drift_s on the lap.
corner_exit_drift_mean_s		Yes		Mean exit_drift_s across the lap’s corners. Positive = throttle application has drifted later than the driver’s own early-stint baseline.
corner_exit_drift_sd_s		Yes		Sample sd of exit_drift_s across the lap’s corners.
corner_exit_drift_max_s		Yes		Largest exit_drift_s on the lap.