theorem iv_identifies_complier_rho
{ρ_complier covZX_complier : ℝ}
(hrel : ivRelevance covZX_complier) :
ivEstimator (ρ_complier * covZX_complier) covZX_complier = ρ_complier :=
iv_consistent hrelCES Estimation Theory: Connecting Theory to Data