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Combining SMA10 and P/E10 Signals

| | Posted in: Fundamental Valuation, Technical Trading

In response to the U.S. stock market timing backtest in "Usefulness of P/E10 as Stock Market Return Predictor", a subscriber suggested combining a 10-month simple moving average (SMA10) technical signal with a P/E10 (or Cyclically Adjusted Price-Earnings ratio, CAPE) fundamental signal. Specifically, we test:

  • SMA10 - bullish/in stocks (bearish/in government bonds) when prior-month stock index level is above (below) its SMA10.
  • SMA10 AND Binary 20-year Bond - in stocks only when both SMA10 and P/E10 Binary 20-year signals are bullish, and otherwise in bonds. The latter rule is bullish when last-month P/E10 is below its rolling 20-year monthly average.
  • SMA10 OR Binary 20-year Bond - in stocks when one or both of the two signals are bullish, and otherwise in bonds.
  • NEITHER SMA10 NOR Binary 20-year Bond - in stocks only when neither signal is bullish, and otherwise in bonds.

We use Robert Shiller's S&P Composite Index to represent stocks. We estimate monthly levels of a simple 10-year government bond index and associated monthly returns using Shiller yield data as described in "Usefulness of P/E10 as Stock Market Return Predictor". We consider buying and holding the S&P Composite Index and the P/E10 Binary 20-year Bond strategy as benchmarks. Using monthly data from Robert Shiller, including S&P Composite Index level, associated dividends, 10-year government bond yields and values of P/E10 as available during January 1871 through December 2019, we find that:

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