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Factor Tilts of Broad Stock Indexes

Posted in Equity Premium, Momentum Investing, Size Effect, Value Premium, Volatility Effects

Do broad (capitalization-weighted) stock market indexes exhibit factor tilts that may indicate concentrations in corresponding risks? In their August 2017 paper entitled "What's in Your Benchmark? A Factor Analysis of Major Market Indexes", Ananth Madhavan, Aleksander Sobczyk and Andrew Ang examine past and present long-only factor exposures of several popular market capitalization indexes. Their analysis involves (1) estimating the factor characteristics of each stock in a broad index; (2) aggregating the characteristics across all stocks in the index; and (3) matching aggregated characteristics to a mimicking portfolio of five indexes representing value, size, quality, momentum and low volatility styles, adjusted for estimated expense ratios. For broad U.S. stock indexes, the five long-only style indexes are:

  • Value - MSCI USA Enhanced Value Index.
  • Size -  MSCI USA Risk Weighted Index.
  • Quality - MSCI USA Sector Neutral Quality Index.
  • Momentum -  MSCI USA Momentum Index.
  • Low Volatility - MSCI USA Minimum Volatility Index.

For broad international indexes, they use corresponding long-only MSCI World style indexes. Using quarterly stock and index data from the end of March 2002 through the end of March 2017, they find that:

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