%0 Journal Article
%J Health Economics
%D 2018
%T 2SLS versus 2SRI: Appropriate methods for rare outcomes and/or rare exposures
%A Basu, Anirban
%A Norma Coe
%A Cole G. Chapman
%K Clinical trials
%K Health Care Outcomes
%K Insurance
%K Monte-Carlo Simulations
%X This study used Monte Carlo simulations to examine the ability of the two‐stage least squares (2SLS) estimator and two‐stage residual inclusion (2SRI) estimators with varying forms of residuals to estimate the local average and population average treatment effect parameters in models with binary outcome, endogenous binary treatment, and single binary instrument. The rarity of the outcome and the treatment was varied across simulation scenarios. Results showed that 2SLS generated consistent estimates of the local average treatment effects (LATE) and biased estimates of the average treatment effects (ATE) across all scenarios. 2SRI approaches, in general, produced biased estimates of both LATE and ATE under all scenarios. 2SRI using generalized residuals minimized the bias in ATE estimates. Use of 2SLS and 2SRI is illustrated in an empirical application estimating the effects of long‐term care insurance on a variety of binary health care utilization outcomes among the near‐elderly using the Health and Retirement Study.
%B Health Economics
%V 27
%P 937 - 955
%8 Jan-06-2018
%G eng
%U http://doi.wiley.com/10.1002/hec.v27.6http://doi.wiley.com/10.1002/hec.3647http://onlinelibrary.wiley.com/wol1/doi/10.1002/hec.3647/fullpdfhttps://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fhec.3647
%N 6
%! Health Economics
%R 10.1002/hec.v27.610.1002/hec.3647
%0 Report
%D 2017
%T Comparing 2SLS vs 2SRI for Binary Outcomes and Binary Exposures
%A Basu, Anirban
%A Norma Coe
%A Cole G. Chapman
%K Economics
%K Health Services Utilization
%K Long-term Care
%X This study uses Monte Carlo simulations to examine the ability of the two-stage least-squares (2SLS) estimator and two-stage residual inclusion (2SRI) estimators with varying forms of residuals to estimate the local average and population average treatment effect parameters in models with binary outcome, endogenous binary treatment, and single binary instrument. The rarity of the outcome and the treatment are varied across simulation scenarios. Results show that 2SLS generated consistent estimates of the LATE and biased estimates of the ATE across all scenarios. 2SRI approaches, in general, produce biased estimates of both LATE and ATE under all scenarios. 2SRI using generalized residuals minimizes the bias in ATE estimates. Use of 2SLS and 2SRI is illustrated in an empirical application estimating the effects of long-term care insurance on a variety of binary healthcare utilization outcomes among the near-elderly using the Health and Retirement Study.
%B NBER Working Paper Series
%I National Bureau of Economic Research
%C Cambridge, MA
%8 09/2017
%G eng
%U http://www.nber.org/papers/w23840.pdf
%R 10.3386/w23840