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Sentiment Indexes and Next-Month Stock Market Return

Posted in Equity Premium, Sentiment Indicators

Do sentiment indexes usefully predict U.S. stock market returns? In his May 2018 doctoral thesis entitled "Forecasting Market Direction with Sentiment Indices", flagged by a subscriber, David Mascio tests whether the following five sentiment indexes predict next-month S&P 500 Index performance:

  1. Investor Sentiment - the Baker-Wurgler Index, which combines six sentiment proxies.
  2. Improved Investor Sentiment - a modification of the Baker-Wurgler Index that suppresses noise among input sentiment proxies.
  3. Current Business Conditions - the ADS Index of the Philadelphia Federal Reserve Bank, which combines six economic variables measured quarterly, monthly and weekly to develop an outlook for the overall economy.
  4. Credit Spread - an index based on the difference in price between between U.S. corporate bonds and U.S. Treasury instruments with matched cash flows. (See "Credit Spread as an Asset Return Predictor" for a simplified approach.)
  5. Financial Uncertainty - an index that combines forecasting errors for large sets of economic and financial variables to assess overall economic/financial uncertainty.

He also tests two combinations of these indexes, a multivariate regression including all sentiment indexes and a LASSO approach. He each month for each index/combination predicts next-month S&P 500 Index return based on a rolling historical regression of 120 months. He tests predictive power by holding (shorting) the S&P 500 Index when the prediction is for the market to go up (down). In his assessment, he considers: frequency of correctly predicting up and down movements; effectiveness in predicting market crashes; and, significance of predictions. Using monthly data for the five sentiment indexes and S&P 500 Index returns during January 1973 through April 2014, he finds that:

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