The Distribution Of The Instrumental Variables Estimator And Its T-Ratio When The Instrument Is A Poor One
Abstract
Instrumental variables estimation is used when there is reason to suspect feedback from a dependent variable to the explanatory variable, but the results will tend to be highly misleading if the instrument is a poor one. In this case, the distribution of the estimated coefficient is concentrated around a value that is related to the amount of feedback rather than to the true coefficient. When the true coefficient is zero, the instrumental variables coefficient will nevertheless appear to be highly significant, and this effect increases with the amount of feedback. Thus, it is in the cases where least squares is a poor estimator that instrumental variables with a poor instrument will be even worse. Some guidelines for practice are suggested. Copyright 1990 by the University of Chicago.(This abstract was borrowed from another version of this item.)
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Bibliographic Info
Paper provided by University of Washington, Department of Economics in its series Working Papers with number 88-07.Length: 23 pages
Date of creation: 1988
Date of revision:
Handle: RePEc:udb:wpaper:88-07
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Related research
Keywords: instrumental variables ; estimator ; econometrics;Other versions of this item:
- Nelson, Charles R & Startz, Richard, 1990. "The Distribution of the Instrumental Variables Estimator and Its t-Ratio When the Instrument Is a Poor One," The Journal of Business, University of Chicago Press, vol. 63(1), pages S125-40, January.
- Charles R. Nelson & Richard Startz, 1988. "The Distribution of the Instrumental Variables Estimator and Its t-RatioWhen the Instrument is a Poor One," NBER Technical Working Papers 0069, National Bureau of Economic Research, Inc.
- Nelson, C. & Startz, R., 1988. "The Distribution Of The Instrumental Variables Estimator And Its T-Ratio When The Instrument Is A Poor One," Discussion Papers in Economics at the University of Washington 88-07, Department of Economics at the University of Washington.
References
References listed on IDEASPlease report citation or reference errors to , or , if you are the registered author of the cited work, log in to your RePEc Author Service profile, click on "citations" and make appropriate adjustments.:
- Hall, Robert E, 1978. "Stochastic Implications of the Life Cycle-Permanent Income Hypothesis: Theory and Evidence," Journal of Political Economy, University of Chicago Press, vol. 86(6), pages 971-87, December.
- Charles R. Nelson & Richard Startz, 1988.
"Some Further Results on the Exact Small Sample Properties of the Instrumental Variable Estimator,"
NBER Technical Working Papers
0068, National Bureau of Economic Research, Inc.
- Nelson, Charles R & Startz, Richard, 1990. "Some Further Results on the Exact Small Sample Properties of the Instrumental Variable Estimator," Econometrica, Econometric Society, vol. 58(4), pages 967-76, July.
- Nelson, C. & Startz, R., 1988. "Some Furthere Results On The Exact Small Sample Properties Of The Instrumental Variable Estimator," Working Papers 88-06, University of Washington, Department of Economics.
- Nelson, C. & Startz, R., 1988. "Some Furthere Results On The Exact Small Sample Properties Of The Instrumental Variable Estimator," Discussion Papers in Economics at the University of Washington 88-06, Department of Economics at the University of Washington.
- Hansen, Lars Peter & Singleton, Kenneth J, 1982. "Generalized Instrumental Variables Estimation of Nonlinear Rational Expectations Models," Econometrica, Econometric Society, vol. 50(5), pages 1269-86, September.
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