Machine Learning Approaches for Equity Market Predictions
44 Pages Posted: 28 Nov 2018 Last revised: 29 Apr 2019
Date Written: April 25, 2019
We empirically analyze equity premium predictions with ‘traditional’ linear regression models and tree-based machine learning approaches. Based on a commonly used dataset of equity market predictors extended by additional fundamental, macroeconomic, sentiment and risk indicators, we find mixed results for machine learning algorithms for equity market predictions. In contrast to sophisticated linear regression models such as penalized least squares or principal component regressions (PCR), the analyzed machine learning algorithms fail to significantly outperform the historical average benchmark forecast. However, an investment strategy that uses machine learning predictions in a market-timing strategy outperforms a passive buy-and-hold investment. Compared to sophisticated linear prediction models machine learning algorithms do not improve forecast accuracy in our problem set.
Keywords: Machine Learning, Equity Return Forecasts, Predictive Regression, Three-Pass Regression Filter, Random Forest, Boosting
JEL Classification: G17, G11, C53
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