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A Relationship Between Regression Tests and Volatility Tests of Market ncy

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  • Jeffrey A. Frankel
  • James H. Stock

Abstract

Volatility tests are an alternative to regression tests for evaluating the joint null hypothesis of market efficiency and risk neutrality. Acomparison of the power of the two kinds of tests depends on what the alternative hypothesis is taken to be. By considering tests based on conditional volatility bounds, we show that if the alternative is that one could"beat the market" using a linear combination of known variables, then the regression tests are at least as powerful as the conditional volatility tests.If the application is to spot and forward markets, then the most powerful conditional volatility test turns out to be equivalent to the analogous regression test in terms of asymptotic power. In other applications,the volatility test will be less powerful than regression tests against our chosen alternative. However, these results are not inconsistent with the observation that volatility tests may be more powerful against other alternative hypoth-eses, such as that risk-averse investors are rationally maximizing the present discounted utility of future consumption,with a time-varying discount rate.

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Bibliographic Info

Paper provided by National Bureau of Economic Research, Inc in its series NBER Working Papers with number 1105.

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Date of creation: Apr 1983
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Publication status: published as Frankel, Jeffrey A. and James H. Stock. "Regression Tests vs. Volatility Tests Efficiency of Foreign Exchange Markets," Journal of International Money and Finance, Vol. 6, 1987, pp. 49-56.
Handle: RePEc:nbr:nberwo:1105

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  1. S. Grossman & R. Shiller, . "The Determinants of the Variability of Stock Market Price," Rodney L. White Center for Financial Research Working Papers 18-80, Wharton School Rodney L. White Center for Financial Research.
  2. Richard A. Meese & Kenneth J. Singleton, 1980. "Rational expectations, risk premia, and the market for spot and forward exchange," International Finance Discussion Papers 165, Board of Governors of the Federal Reserve System (U.S.).
  3. Shiller, Robert J, 1979. "The Volatility of Long-Term Interest Rates and Expectations Models of the Term Structure," Journal of Political Economy, University of Chicago Press, vol. 87(6), pages 1190-1219, December.
  4. Singleton, Kenneth J, 1980. "Expectations Models of the Term Structure and Implied Variance Bounds," Journal of Political Economy, University of Chicago Press, vol. 88(6), pages 1159-76, December.
  5. Lawrence H. Summers, 1982. "Do We Really Know That Financial Markets Are Efficient?," NBER Working Papers 0994, National Bureau of Economic Research, Inc.
  6. Shiller, Robert J, 1981. "The Use of Volatility Measures in Assessing Market Efficiency," Journal of Finance, American Finance Association, vol. 36(2), pages 291-304, May.
  7. Fama, Eugene F, 1970. "Efficient Capital Markets: A Review of Theory and Empirical Work," Journal of Finance, American Finance Association, vol. 25(2), pages 383-417, May.
  8. Shiller, Robert J, 1981. "Do Stock Prices Move Too Much to be Justified by Subsequent Changes in Dividends?," American Economic Review, American Economic Association, vol. 71(3), pages 421-36, June.
  9. Robert P. Flood, 1981. "Explanations of Exchange Rate Volatility and Other Empirical Regularities in Some Popular Models of the Foreign Exchange Market," NBER Working Papers 0625, National Bureau of Economic Research, Inc.
  10. LeRoy, Stephen F & LaCivita, C J, 1981. "Risk Aversion and the Dispersion of Asset Prices," The Journal of Business, University of Chicago Press, vol. 54(4), pages 535-47, October.
  11. LeRoy, Stephen F & Porter, Richard D, 1981. "The Present-Value Relation: Tests Based on Implied Variance Bounds," Econometrica, Econometric Society, vol. 49(3), pages 555-74, May.
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Cited by:
  1. Luigi Guiso & Paola Sapienza & Luigi Zingales, 2007. "Cultural Biases in Economic Exchange?," Economics Working Papers ECO2007/42, European University Institute.
  2. N. Gregory Mankiw & David Romer & Matthew D. Shapiro, 1985. "An Unbiased Reexamination of Stock Market Volatility," Cowles Foundation Discussion Papers 758, Cowles Foundation for Research in Economics, Yale University.
  3. Erwin W. Heri, 1986. "Irrationales rational gesehen: Eine Übersicht über die Theorie der "Bubbles"," Swiss Journal of Economics and Statistics (SJES), Swiss Society of Economics and Statistics (SSES), vol. 122(II), pages 163-186, June.

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