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That instrument is lousy! In search of agreement when using instrumental variables estimation in substance use research

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  • Michael T. French
  • Ioana Popovici

Abstract

The primary statistical challenge that must be addressed when using cross‐sectional data to estimate the consequences of consuming addictive substances is the likely endogeneity of substance use. While economists are in agreement on the need to consider potential endogeneity bias and the value of instrumental variables estimation, the selection of credible instruments is a topic of heated debate in the field. Rather than attempt to resolve this debate, our paper highlights the diversity of judgments about what constitutes appropriate instruments for substance use based on a comprehensive review of the economics literature since 1990. We then offer recommendations related to the selection of reliable instruments in future studies. Copyright © 2009 John Wiley & Sons, Ltd.

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  • Michael T. French & Ioana Popovici, 2011. "That instrument is lousy! In search of agreement when using instrumental variables estimation in substance use research," Health Economics, John Wiley & Sons, Ltd., vol. 20(2), pages 127-146, February.
  • Handle: RePEc:wly:hlthec:v:20:y:2011:i:2:p:127-146
    DOI: 10.1002/hec.1572
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    1. Joshua D. Angrist & Alan B. Krueger, 2001. "Instrumental Variables and the Search for Identification: From Supply and Demand to Natural Experiments," Journal of Economic Perspectives, American Economic Association, vol. 15(4), pages 69-85, Fall.
    2. Hansen, Lars Peter, 1982. "Large Sample Properties of Generalized Method of Moments Estimators," Econometrica, Econometric Society, vol. 50(4), pages 1029-1054, July.
    3. Renna, Francesco, 2008. "Teens' alcohol consumption and schooling," Economics of Education Review, Elsevier, vol. 27(1), pages 69-78, February.
    4. Robert Kaestner, 1994. "The Effect of Illicit Drug Use on the Labor Supply of Young Adults," Journal of Human Resources, University of Wisconsin Press, vol. 29(1), pages 126-155.
    5. Jeremy W. Bray, 2005. "Alcohol Use, Human Capital, and Wages," Journal of Labor Economics, University of Chicago Press, vol. 23(2), pages 279-312, April.
    6. Michael T. French & Johanna C. Maclean, 2006. "Underage alcohol use, delinquency, and criminal activity," Health Economics, John Wiley & Sons, Ltd., vol. 15(12), pages 1261-1281, December.
    7. Mullahy, John & Sindelar, Jody, 1996. "Employment, unemployment, and problem drinking," Journal of Health Economics, Elsevier, vol. 15(4), pages 409-434, August.
    8. van Ours, Jan C., 2002. "A pint a day raises a man's pay; but smoking blows that gain away," IZA Discussion Papers 473, Institute of Labor Economics (IZA).
    9. Lundborg, Petter, 2006. "Having the wrong friends? Peer effects in adolescent substance use," Journal of Health Economics, Elsevier, vol. 25(2), pages 214-233, March.
    10. Edvard Johansson & Hannu Alho & Urpo Kiiskinen & Kari Poikolainen, 2007. "The association of alcohol dependency with employment probability: evidence from the population survey ‘Health 2000 in Finland’," Health Economics, John Wiley & Sons, Ltd., vol. 16(7), pages 739-754, July.
    11. Donald W.K. Andrews & James H. Stock, 2005. "Inference with Weak Instruments," Cowles Foundation Discussion Papers 1530, Cowles Foundation for Research in Economics, Yale University.
    12. Kling, Jeffrey R, 2001. "Interpreting Instrumental Variables Estimates of the Returns to Schooling," Journal of Business & Economic Statistics, American Statistical Association, vol. 19(3), pages 358-364, July.
    13. Tetsuji Yamada & Michael Kendix & Tadashi Yamada, 1993. "The Impact of Alcohol Consumption and Marijuana Use on High School Graduation," NBER Working Papers 4497, National Bureau of Economic Research, Inc.
    14. Rosalie Liccardo Pacula & Jamie F. Chriqui & Joanna King, 2003. "Marijuana Decriminalization: What does it mean in the United States?," NBER Working Papers 9690, National Bureau of Economic Research, Inc.
    15. Beenstock, Michael & Rahav, Giora, 2002. "Testing Gateway Theory: do cigarette prices affect illicit drug use?," Journal of Health Economics, Elsevier, vol. 21(4), pages 679-698, July.
    16. Pinka Chatterji, 2006. "Illicit drug use and educational attainment," Health Economics, John Wiley & Sons, Ltd., vol. 15(5), pages 489-511, May.
    17. Chaloupka, Frank J. & Wechsler, Henry, 1997. "Price, tobacco control policies and smoking among young adults," Journal of Health Economics, Elsevier, vol. 16(3), pages 359-373, June.
    18. Chaloupka, Frank, 1991. "Rational Addictive Behavior and Cigarette Smoking," Journal of Political Economy, University of Chicago Press, vol. 99(4), pages 722-742, August.
    19. Alison Snow Jones & Deborah J. Miller & David S. Salkever, 1999. "Parental use of alcohol and children's behavioural health: a household production analysis," Health Economics, John Wiley & Sons, Ltd., vol. 8(8), pages 661-683, December.
    20. Francesco Renna, 2007. "The economic cost of teen drinking: late graduation and lowered earnings," Health Economics, John Wiley & Sons, Ltd., vol. 16(4), pages 407-419, April.
    21. Petter Lundborg, 2007. "Smoking, information sources, and risk perceptions—New results on Swedish data," Journal of Risk and Uncertainty, Springer, vol. 34(3), pages 217-240, June.
    22. Hausman, Jerry, 2015. "Specification tests in econometrics," Applied Econometrics, Russian Presidential Academy of National Economy and Public Administration (RANEPA), vol. 38(2), pages 112-134.
    23. Angrist, Joshua D & Krueger, Alan B, 1995. "Split-Sample Instrumental Variables Estimates of the Return to Schooling," Journal of Business & Economic Statistics, American Statistical Association, vol. 13(2), pages 225-235, April.
    24. Fuller, Wayne A, 1977. "Some Properties of a Modification of the Limited Information Estimator," Econometrica, Econometric Society, vol. 45(4), pages 939-953, May.
    25. Donald S. Kenkel & David C. Ribar, 1994. "Alcohol Consumption and Young Adults' Socioeconomic Status," Brookings Papers on Economic Activity, Economic Studies Program, The Brookings Institution, vol. 25(1994 Micr), pages 119-175.
    26. Erdal Tekin, 2004. "Employment, Wages, and Alcohol Consumption in Russia," Southern Economic Journal, John Wiley & Sons, vol. 71(2), pages 397-417, October.
    27. Michael T. French & M. Christopher Roebuck & Pierre Kébreau Alexandre, 2001. "Illicit Drug Use, Employment, and Labor Force Participation," Southern Economic Journal, John Wiley & Sons, vol. 68(2), pages 349-368, October.
    28. Roebuck, M. Christopher & French, Michael T. & Dennis, Michael L., 2004. "Adolescent marijuana use and school attendance," Economics of Education Review, Elsevier, vol. 23(2), pages 133-141, April.
    29. Clark, Andrew & Etile, Fabrice, 2002. "Do health changes affect smoking? Evidence from British panel data," Journal of Health Economics, Elsevier, vol. 21(4), pages 533-562, July.
    30. Joshua D. Angrist & Jörn-Steffen Pischke, 2009. "Mostly Harmless Econometrics: An Empiricist's Companion," Economics Books, Princeton University Press, edition 1, number 8769.
    31. Dee, Thomas S., 1999. "The complementarity of teen smoking and drinking," Journal of Health Economics, Elsevier, vol. 18(6), pages 769-793, December.
    32. Dee, Thomas S., 1999. "State alcohol policies, teen drinking and traffic fatalities," Journal of Public Economics, Elsevier, vol. 72(2), pages 289-315, May.
    33. Douglas Staiger & James H. Stock, 1997. "Instrumental Variables Regression with Weak Instruments," Econometrica, Econometric Society, vol. 65(3), pages 557-586, May.
    34. Weiwei Feng & Wei Zhou & J.S. Butler & Brenda M. Booth & Michael T. French, 2001. "The impact of problem drinking on employment," Health Economics, John Wiley & Sons, Ltd., vol. 10(6), pages 509-521, September.
    35. DeCicca, Philip & Kenkel, Don & Mathios, Alan, 2008. "Cigarette taxes and the transition from youth to adult smoking: Smoking initiation, cessation, and participation," Journal of Health Economics, Elsevier, vol. 27(4), pages 904-917, July.
    36. Grossman, Michael & Chaloupka, Frank J., 1998. "The demand for cocaine by young adults: a rational addiction approach," Journal of Health Economics, Elsevier, vol. 17(4), pages 427-474, August.
    37. Stock, James H & Wright, Jonathan H & Yogo, Motohiro, 2002. "A Survey of Weak Instruments and Weak Identification in Generalized Method of Moments," Journal of Business & Economic Statistics, American Statistical Association, vol. 20(4), pages 518-529, October.
    38. Donald W. K. Andrews & Marcelo J. Moreira & James H. Stock, 2006. "Optimal Two-Sided Invariant Similar Tests for Instrumental Variables Regression," Econometrica, Econometric Society, vol. 74(3), pages 715-752, May.
    39. Andrew M. Gill & Robert J. Michaels, 1992. "Does Drug Use Lower Wages?," ILR Review, Cornell University, ILR School, vol. 45(3), pages 419-434, April.
    40. Sandra L. Decker & Amy Ellen Schwartz, 2000. "Cigarettes and Alcohol: Substitutes or Complements?," NBER Working Papers 7535, National Bureau of Economic Research, Inc.
    41. Ziggy MacDonald & Michael A. Shields, 2004. "Does problem drinking affect employment? Evidence from England," Health Economics, John Wiley & Sons, Ltd., vol. 13(2), pages 139-155, February.
    42. Charles A. Register & Donald R. Williams, 1992. "Labor Market Effects of Marijuana and Cocaine Use among Young Men," ILR Review, Cornell University, ILR School, vol. 45(3), pages 435-448, April.
    43. Rashad, Inas, 2006. "Structural estimation of caloric intake, exercise, smoking, and obesity," The Quarterly Review of Economics and Finance, Elsevier, vol. 46(2), pages 268-283, May.
    44. Hana Ross & Lisa M. Powell & John A. Tauras & Frank J. Chaloupka, 2005. "New Evidence on Youth Smoking Behavior based on Experimental Price Increases," Contemporary Economic Policy, Western Economic Association International, vol. 23(2), pages 195-210, April.
    45. Manning, Willard G. & Blumberg, Linda & Moulton, Lawrence H., 1995. "The demand for alcohol: The differential response to price," Journal of Health Economics, Elsevier, vol. 14(2), pages 123-148, June.
    46. Cook, Philip J. & Moore, Michael J., 1999. "Alcohol," Working Papers 156, The University of Chicago Booth School of Business, George J. Stigler Center for the Study of the Economy and the State.
    47. Sen, Bisakha, 2002. "Does alcohol-use increase the risk of sexual intercourse among adolescents? Evidence from the NLSY97," Journal of Health Economics, Elsevier, vol. 21(6), pages 1085-1093, November.
    48. Chatterji, Pinka, 2006. "Does alcohol use during high school affect educational attainment?: Evidence from the National Education Longitudinal Study," Economics of Education Review, Elsevier, vol. 25(5), pages 482-497, October.
    49. repec:fth:prinin:455 is not listed on IDEAS
    50. Robert Kaestner, 1994. "New Estimates of the Effect of Marijuana and Cocaine Use on Wages," ILR Review, Cornell University, ILR School, vol. 47(3), pages 454-470, April.
    51. Averett Susan L & Rees Daniel I & Duncan Brian & Argys Laura, 2004. "Race, Ethnicity, and Gender Differences in the Relationship Between Substance Use and Adolescent Sexual Behavior," The B.E. Journal of Economic Analysis & Policy, De Gruyter, vol. 4(1), pages 1-34, September.
    52. Jenny Williams & Lisa Powell & Henry Wechsler, 2003. "Does alcohol consumption reduce human capital accumulation? Evidence from the College Alcohol Study," Applied Economics, Taylor & Francis Journals, vol. 35(10), pages 1227-1239.
    53. Jenny Williams, 2005. "Habit formation and college students' demand for alcohol," Health Economics, John Wiley & Sons, Ltd., vol. 14(2), pages 119-134, February.
    54. Cook, Philip J. & Moore, Michael J., 1993. "Drinking and schooling," Journal of Health Economics, Elsevier, vol. 12(4), pages 411-429, December.
    55. Andrew M. Jones & José M. Labeaga, 2003. "Individual heterogeneity and censoring in panel data estimates of tobacco expenditure," Journal of Applied Econometrics, John Wiley & Sons, Ltd., vol. 18(2), pages 157-177.
    56. Jan C. Van Ours, 2007. "The Effects of Cannabis Use on Wages of Prime‐age Males," Oxford Bulletin of Economics and Statistics, Department of Economics, University of Oxford, vol. 69(5), pages 619-634, October.
    57. Brent D. Mast & Bruce L. Benson & David W. Rasmussen, 1999. "Beer Taxation and Alcohol-Related Traffic Fatalities," Southern Economic Journal, John Wiley & Sons, vol. 66(2), pages 214-249, October.
    58. Evans, William N. & Ringel, Jeanne S., 1999. "Can higher cigarette taxes improve birth outcomes?," Journal of Public Economics, Elsevier, vol. 72(1), pages 135-154, April.
    59. Farrell, Susan & Manning, Willard G. & Finch, Michael D., 2003. "Alcohol dependence and the price of alcoholic beverages," Journal of Health Economics, Elsevier, vol. 22(1), pages 117-147, January.
    60. Amy M. Wolaver, 2002. "Effects Of Heavy Drinking In College On Study Effort, Grade Point Average, And Major Choice," Contemporary Economic Policy, Western Economic Association International, vol. 20(4), pages 415-428, October.
    61. Besley, Timothy & Case, Anne, 2000. "Unnatural Experiments? Estimating the Incidence of Endogenous Policies," Economic Journal, Royal Economic Society, vol. 110(467), pages 672-694, November.
    62. Lisa Cameron & Jenny Williams, 2001. "Cannabis, Alcohol and Cigarettes: Substitutes or Complements?," The Economic Record, The Economic Society of Australia, vol. 77(236), pages 19-34, March.
    63. Luft, Harold S, 1975. "The Impact of Poor Health on Earnings," The Review of Economics and Statistics, MIT Press, vol. 57(1), pages 43-57, February.
    64. Mullahy, John & Portney, Paul R., 1990. "Air pollution, cigarette smoking, and the production of respiratory health," Journal of Health Economics, Elsevier, vol. 9(2), pages 193-205, September.
    65. French, Michael T. & McGeary, Kerry Anne & Chitwood, Dale D. & McCoy, Clyde B., 2000. "Chronic illicit drug use, health services utilization and the cost of medical care," Social Science & Medicine, Elsevier, vol. 50(12), pages 1703-1713, June.
    66. Kaestner, Robert, 1991. "The Effect of Illicit Drug Use on the Wages of Young Adults," Journal of Labor Economics, University of Chicago Press, vol. 9(4), pages 381-412, October.
    67. Steven F. Koch & Kerry Anne McGeary, 2005. "The Effect of Youth Alcohol Initiation on High School Completion," Economic Inquiry, Western Economic Association International, vol. 43(4), pages 750-765, October.
    68. Philip DeCicca & Donald Kenkel & Alan Mathios, 2002. "Putting Out the Fires: Will Higher Taxes Reduce the Onset of Youth Smoking?," Journal of Political Economy, University of Chicago Press, vol. 110(1), pages 144-169, February.
    69. Frank J. Chaloupka & Michael Grossman, 1996. "Price, Tobacco Control Policies and Youth Smoking," NBER Working Papers 5740, National Bureau of Economic Research, Inc.
    70. Ziggy Macdonald & Michael A. Shields, 2001. "The Impact of Alcohol Consumption on Occupational Attainment in England," Economica, London School of Economics and Political Science, vol. 68(271), pages 427-453, August.
    71. Pierre Kébreau Alexandre & Michael T. French, 2004. "Further Evidence on the Labor Market Effects of Addiction: Chronic Drug Use and Employment in Metropolitan Miami," Contemporary Economic Policy, Western Economic Association International, vol. 22(3), pages 382-393, July.
    72. van Ours, Jan C., 2004. "A pint a day raises a man's pay; but smoking blows that gain away," Journal of Health Economics, Elsevier, vol. 23(5), pages 863-886, September.
    73. Rashad, Inas & Kaestner, Robert, 2004. "Teenage sex, drugs and alcohol use: problems identifying the cause of risky behaviors," Journal of Health Economics, Elsevier, vol. 23(3), pages 493-503, May.
    74. Kenneth Bollen & David Guilkey & Thomas Mroz, 1995. "Binary outcomes and endogenous explanatory variables: Tests and solutions with an application to the demand for contraceptive use in tunisia," Demography, Springer;Population Association of America (PAA), vol. 32(1), pages 111-131, February.
    75. Joshua Angrist & Alan Krueger, 2001. "Instrumental Variables and the Search for Identification: From Supply and Demand to Natural Experiments," Working Papers 834, Princeton University, Department of Economics, Industrial Relations Section..
    76. SF Koch & DC Ribar, 2001. "A Siblings Analysis Of The Effects Of Alcohol Consumption Onset On Educational Attainment," Contemporary Economic Policy, Western Economic Association International, vol. 19(2), pages 162-174, April.
    77. Thomas S. Dee & William N. Evans, 2003. "Teen Drinking and Educational Attainment: Evidence from Two-Sample Instrumental Variables Estimates," Journal of Labor Economics, University of Chicago Press, vol. 21(1), pages 178-209, January.
    78. Jeffrey DeSimone, 1998. "Is Marijuana a Gateway Drug?," Eastern Economic Journal, Eastern Economic Association, vol. 24(2), pages 149-164, Spring.
    79. Garry F. Barrett, 2002. "The Effect of Alcohol Consumption on Earnings," The Economic Record, The Economic Society of Australia, vol. 78(240), pages 79-96, March.
    80. Michael P. Murray, 2006. "Avoiding Invalid Instruments and Coping with Weak Instruments," Journal of Economic Perspectives, American Economic Association, vol. 20(4), pages 111-132, Fall.
    81. Zarkin, Gary A. & Mroz, Thomas A. & Bray, Jeremy W. & French, Michael T., 1998. "The relationship between drug use and labor supply for young men," Labour Economics, Elsevier, vol. 5(4), pages 385-409, December.
    82. Jeff DeSimone, 2002. "Illegal Drug Use and Employment," Journal of Labor Economics, University of Chicago Press, vol. 20(4), pages 952-977, October.
    83. M. Christopher Auld, 2005. "Smoking, Drinking, and Income," Journal of Human Resources, University of Wisconsin Press, vol. 40(2).
    84. Rees, Daniel I. & Argys, Laura M. & Averett, Susan L., 2001. "New evidence on the relationship between substance use and adolescent sexual behavior," Journal of Health Economics, Elsevier, vol. 20(5), pages 835-845, September.
    85. Hana Ross & Frank J. Chaloupka, 2004. "The Effect of Public Policies and Prices on Youth Smoking," Southern Economic Journal, John Wiley & Sons, vol. 70(4), pages 796-815, April.
    86. Anderson, T. W. & Hsiao, Cheng, 1982. "Formulation and estimation of dynamic models using panel data," Journal of Econometrics, Elsevier, vol. 18(1), pages 47-82, January.
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