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Simple Tests of Sy Harding’s Seasonal Timing Strategy

Posted in Calendar Effects, Technical Trading

Does the technically adjusted Seasonal Timing Strategy popularized some years ago in Sy Harding's Street Smart Report Online (now unavailable due to Mr. Harding's death) generate attractive performance? This strategy combines "the market's best average calendar entry [October 16] and exit [April 20] days with a technical indicator, the Moving Average Convergence Divergence (MACD)." According to Street Smart Report Online, applying this strategy to a Dow Jones Industrial Average (DJIA) index fund generated a cumulative return of 213% during 1999 through 2012, compared to 93% for the DJIA itself. To check over a longer sample period with an alternative market proxy, we apply the strategy to SPDR S&P 500 (SPY) since its inception and consider several alternatives, as follows:

  1. SPY - buy and hold SPY.
  2. Seasonal-MACD - seasonal timing per specified dates with MACD refinement, holding cash when not in SPY.
  3. Seasonal Only - seasonal timing per the same dates without MACD refinement, again holding cash when not in SPY.
  4. SMA200 - hold SPY (cash) when the S&P 500 Index is above (below) its 200-day simple moving average at the prior daily close. 

For all strategies, we use the yield on short-term U.S. Treasury bills (T-bills) as the return on cash. Using daily closes for the S&P 500 Index, dividend-adjusted closes for SPY and T-bill yield during 1/29/93 (SPY inception) through 5/13/19, we find that:

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