Should Copula Endogeneity Correction Include Generated Regressors for Higher-order Terms? No, It Hurts / Yi Qian, Hui Xie, Anthony Koschmann.

Format:

Book

Author/Creator:

Qian, Yi.

Contributor:

National Bureau of Economic Research.

Xie, Hui.

Koschmann, Anthony.

Series:

Working Paper Series (National Bureau of Economic Research) no. w29978.

NBER working paper series no. w29978

Language:

English

Physical Description:

1 online resource: illustrations (black and white);

Place of Publication:

Cambridge, Mass. National Bureau of Economic Research 2022.

Summary:

Causal inference in empirical studies is often challenging because of the presence of endogenous regressors. The classical approach to the problem requires using instrumental variables that must satisfy the stringent condition of exclusion restriction. A forefront of recent research is a new paradigm of handling endogenous regressors without using instrumental variables. Park and Gupta (Marketing Science, 2012) proposed instrument-free estimation using copulas that has been increasingly used in practical applications to address endogeneity bias. A relevant issue not studied is how to handle the higher-order terms (e.g., interaction and quadratic terms) of endogenous regressors using the copula approach. Recent applications of the approach have used disparate ways of handling these higher-order endogenous terms with unclear consequences. We show that once copula correction terms for the main effects of endogenous regressors are included as generated regressors, there is no need to include additional correction terms for the higher-order terms. This simplicity in handling higher-order endogenous regression terms is a merit of the instrument-free copula bias correction approach. More importantly, adding these unnecessary correction terms has harmful effects and leads to sub-optimal solutions of endogeneity bias, including finite-sample estimation bias and substantially inflated variability in estimates.

Notes:

Print version record

April 2022.