Big Moves On Mondays

Last Updated on August 26, 2021 by Oddmund Groette

I caught some ideas from Paststat and Quantifiable edges to test “big” movement on Mondays. I have tested this in a previous post, but this time we’ll look at what happens to SPY the rest of the week.

Here are the criteria for long:

  1. Today is Monday
  2. Calculate a 25 day average of the daily H-L range.
  3. SPY must fall at least 50% number 2 from Friday’s close.
  4. Go long at the close.
  5. Exit at close 4 days later.
P/L #Fills Avg.
75.27 63.00 1.19

The numbers in the table above are in % and from 2005 until March 2013. Pretty good numbers considering the amount of time in the market is about 15%.

What if we turn it upside down and go short:

P/L #Fills Avg.
-25.45 76.00 -0.33

Here is the equity curve (blue is long and pink is short):

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