Function counterfactual_trajectory

pub fn counterfactual_trajectory(
    pre_change: &[(i64, &[f32])],
    post_change: &[(i64, &[f32])],
    change_point: i64,
) -> Result<CounterfactualResult, AnalyticsError>

Compute a counterfactual trajectory analysis.

Splits the trajectory at change_point, fits a linear trend to the pre-change segment, extrapolates beyond the change point, and compares with the actual post-change data.

Arguments

• pre_change — Trajectory before the change point (sorted by timestamp)
• post_change — Trajectory after the change point (sorted by timestamp)
• change_point — Timestamp of the detected change

Errors

Returns AnalyticsError::InsufficientData if pre_change has < 2 points or post_change is empty.