In the December 2002 issue of Technical Analysis of 
Stocks & Commodities magazine, Jay Kaeppel presented a system of being in 
the market only when historical seasonality is positive.  Mr. Kaeppel used 
four tendencies:
  1.  The two days immediately prior to an 
  exchange holiday (New Year's Day, MLK Day, Presidents' Day, Good Friday, 
  Memorial Day, July 4th, Labor Day, Thanksgiving and Christmas).  
  NOTE:  This has shifted somewhat over the years, and we have made the 
  appropriate adjustments beginning in the 2008 calendars.
  2.  The last trading day of the month and 
  the first four trading days of the next month.
  3.  November 1st through the 3rd trading 
  day in May.
  4.  The most favorable 15 months of the 
  48-month Presidential election cycle.  This begins on October 1st two 
  years prior to each Presidential election, and ends on December 31st of the 
  following year.
Each tendency gets a score of 1.  When you have 
two or more tendencies working for you at the same time (i.e. a score of +2 or 
better), market performance over time is greatly enhanced.
Mr. Kaeppel tested this system on the Nasdaq from 
1972 - 2002 and found that readings of +2 or greater outperformed non-seasonal 
days by a significant degree.  He also found that readings of 0 
underperformed all nonzero seasonal days by a likewise significant 
degree.
The calendars below shows the score for each of the 
upcoming months.  If the day is highlighted in red, then the score is 
"maximum bearish" by being a 0.  If it is highlighted in green, then it is 
more bullish than a usual day by being scored a 2, 3 or 4.
If you see a 
 or 
 then there is some extra seasonality evident that day, either negative 
or positive, respectively.  For example, the day after an options 
expiration tends to be negative, so you will see a 
 on those days, as well as some holidays which show a negative bias 
when traders return from the break.
Below the calendars, you will see some performance 
statistics from trading on days with each of the possible "scores".
  
  
    | 
       AUGUST 2008  | 
  
    | Mon | 
    Tue | 
    Wed | 
    Thu | 
    Fri | 
  
    |   | 
      | 
      | 
      | 
    
       1 
      1  | 
  
    | 
       4 
      1  | 
    
       5 
      1  | 
    
       6 
      1  | 
    
       7 
      0  | 
    
       8 
      0  | 
  
    | 
       11 
      0  | 
    
       12 
      0  | 
    
       13 
      0  | 
    
       14 
      0  | 
    
       15 
      0  | 
  
    | 
       18 
      0   | 
    
       19 
      0  | 
    
       20 
      0  | 
    
       21 
      0  | 
    
       22 
      0  | 
  
    | 
       25 
      0  | 
    
       26 
      0  | 
    
       27 
      0  | 
    
       28 
      0  | 
    
       29 
      2  | 
 
  
  
    | 
       SEPTEMBER 2008  | 
  
    | Mon | 
    Tue | 
    Wed | 
    Thu | 
    Fri | 
  
    | 
       1 
      MKT 
       CLOSED  | 
    
       2 
      1  | 
    
       3 
      1  | 
    
       4 
      1  | 
    
       5 
      1  | 
  
    | 
       8 
      0  | 
    
       9 
      0  | 
    
       10 
      0  | 
    
       11 
      0  | 
    
       12 
      0  | 
  
    | 
       15 
      0  | 
    
       16 
      0  | 
    
       17 
      0  | 
    
       18 
      0  | 
    
       19 
      0  | 
  
    | 
       22 
      0   | 
    
       23 
      0  | 
    
       24 
      0  | 
    
       25 
      0  | 
    
       26 
      0  | 
  
    | 
       29 
      0  | 
    
       30 
      1  | 
      | 
      | 
      | 
 
  
  
    | 
       OCTOBER 2008  | 
  
    | Mon | 
    Tue | 
    Wed | 
    Thu | 
    Fri | 
  
    |   | 
      | 
    
       1 
      1  | 
    
       2 
      1  | 
    
       3 
      1  | 
  
    | 
       6 
      1  | 
    
       7 
      0  | 
    
       8 
      0  | 
    
       9 
      0  | 
    
       10 
      0  | 
  
    | 
       13 
      0  | 
    
       14 
      0  | 
    
       15 
      0  | 
    
       16 
      0  | 
    
       17 
      0  | 
  
    | 
       20 
      0   | 
    
       21 
      0  | 
    
       22 
      0  | 
    
       23 
      0  | 
    
       24 
      0  | 
  
    | 
       27 
      0  | 
    
       28 
      0  | 
    
       29 
      0  | 
    
       30 
      0  | 
    
       31 
      1  | 
 
  
  
    | 
       NOVEMBER 2008  | 
  
    | Mon | 
    Tue | 
    Wed | 
    Thu | 
    Fri | 
  
    | 
       3 
      2  | 
    
       4 
      2  | 
    
       5 
      2  | 
    
       6 
      2  | 
    
       7 
      1  | 
  
    | 
       10 
      1  | 
    
       11 
      1  | 
    
       12 
      1  | 
    
       13 
      1  | 
    
       14 
      1  | 
  
    | 
       17 
      1  | 
    
       18 
      1  | 
    
       19 
      1  | 
    
       20 
      1  | 
    
       21 
      1  | 
  
    | 
       24 
      1   | 
    
       25 
      2  | 
    
       26 
      2  | 
    
       27 
      MKT 
       CLOSED  | 
    
       28 
      2  | 
 
  
  
    | 
       DECEMBER 2008  | 
  
    | Mon | 
    Tue | 
    Wed | 
    Thu | 
    Fri | 
  
    | 
       1 
      2  | 
    
       2 
      2  | 
    
       3 
      2  | 
    
       4 
      2  | 
    
       5 
      1  | 
  
    | 
       8 
      1  | 
    
       9 
      1  | 
    
       10 
      1  | 
    
       11 
      1  | 
    
       12 
      1  | 
  
    | 
       15 
      1  | 
    
       16 
      1  | 
    
       17 
      1  | 
    
       18 
      1  | 
    
       19 
      1  | 
  
    | 
       22 
      1   | 
    
       23 
      1  | 
    
       24 
      2  | 
    
       25 
      MKT 
       CLOSED  | 
    
       26 
      2  | 
  
    | 
       29 
      1  | 
    
       30 
      1  | 
    
       31 
      3  | 
      | 
      | 
   
PERFORMANCE DATA
The table below uses the 
S&P 500 from 1950 through mid-2004, and shows the market?s performance for 
days with each of the four possible total scores. 
  
  
    | 
       S&P 500 Performance by 
      Seasonality Index 
      1950 - 2004  | 
  
    |   | 
    
       0  | 
    
       1  | 
    
       2  | 
    
       3  | 
    
       4  | 
  
    | Avg 
      Ret | 
    
       -0.03%  | 
    
       0.01%  | 
    
       0.08%  | 
    
       0.23%  | 
    
       0.21%  | 
  
    | % 
      Pos | 
    
       50%  | 
    
       51%  | 
    
       56%  | 
    
       62%  | 
    
       70%  | 
  
    | # 
      Days | 
    
       3604  | 
    
       5647  | 
    
       3555  | 
    
       860  | 
    
       33  | 
 
We can see from the table that 
on a day when none of the four seasonal biases are present, the S&P actually 
showed a negative average return, and was positive on almost exactly 50% of the 
3,604 days.  
As we notched more biases in 
our favor, the S&P?s performance improved, slightly at first and then 
dramatically.  By the time we had 3 out of the 4 biases present on a given 
day, the S&P showed an impressive average return of 0.23%, with 62% of the 
days being positive.  Those rare ?4? days, when all biases were present, 
also gave an impressive performance, with even more of the days being 
positive.
Let?s say that in 1950, you 
had $10,000 to trade and decided to buy the S&P 500 (cash index) at every 
open and sell it at every close, using all your money.  Your $10,000 would 
have grown into just under $2 million by now.  Now let?s say that when a 
?0? day arrived, you decided to stay in cash and not trade that day.  
Interestingly enough, even 
though you were in the market only 74% of the time, your $10,000 would have 
still grown into just under $2 million.  Now let?s make it really 
interesting?when you saw a ?0? day, you still went to cash, but if it was a ?3? 
or ?4? day, then you decided to play the odds and you leveraged your bets 
2-to-1.  In that case, your $10,000 initial stake would have grown into 
more than $13 million, a return of over 133,000%.
  
  
    |   | 
    
       Buy Every Open, 
      Sell Every Close?  | 
    
       Buy at Open and 
      Sell at Close, IF Day is not a ?0??  | 
    
       Buy at Open and 
      Sell at Close, IF Day is not a ?0?, and Double Down if it is a ?3? 
      or ?4??  | 
  
    | $10,000 
      Becomes? | 
    
       $1,994,652  | 
    
       $1,997,418  | 
    
       $13,320,444  | 
  
    | % 
      Return | 
    
       19,847%  | 
    
       19,874%  | 
    
       133,104%  | 
 
PLEASE 
NOTE that this 
is NOT a trading system.  We have made no adjustments for dividends, 
slippage, commissions, interest on cash balances, etc.  Also, for the open 
price I used yesterday?s closing price, so gap opens are not accounted for ? not 
that it matters, since it wasn?t really even possible to trade the S&P 500 
itself until the futures market came along in the early 1980?s.  
By watching when 
the market may or may not have a positive bent to it, we can adjust our 
expectations accordingly.  While it is difficult to implement this type of 
information in practice, we do suggest that especially shorter-term traders 
watch the Seasonality Index daily, and when we get a ?3? or ?4? day, it probably 
pays to be more aggressive than usual on the long side.  
It would be 
foolhardy to suggest going short on ?0? days, but we do think it is more 
difficult to make money on the long side on those days than others.  
Longer-term traders may want to keep track of what the upcoming month may hold 
as far as these scores go, and when they begin to add up, it can pay to be more 
aggressive on the long side.