Function estimateIV

estimateIV(
    data: number[][],
    treatmentIdx: number,
    outcomeIdx: number,
    ivIdx: number,
    covariateIndices?: number[],
): { ate: number; se: number }
Two-Stage Least Squares instrumental variable estimator.

Stage 1: X = γ₀ + γ₁ * IV + ε Stage 2: Y = β₀ + β₁ * X̂ + ε

ATE = β₁
Parameters
- data: number[][]
- treatmentIdx: number
- outcomeIdx: number
- ivIdx: number
- covariateIndices: number[] = []
Returns { ate: number; se: number }
- Defined in pipeline/src/infer/effect-estimation.ts:194