Does Stock Price Move Larger after Weekend, Holiday, or Other Market Closures.?

 Purpose:

  • News flow continuously, events happen regardless markets' schedule;
  • For example, markets digest '1 day information from Tuesday to Friday;
  • On Monday markets have to chew up 3 days information (Saturday, Sunday, and Monday);
  • As such, price movements on Monday must be bigger than other weekdays, is my idea.


Method:

  • to see this I go over S&P 500 index from 1970;
  • Sort daily (business day) close price change into groups by calendar day difference;
  • calculate average, and standard deviation for each group.

Results:

  • Below figure shows the summary;
  • Standard deviation increased along with number of days up to 3.
  • In date-wise, 2 days standard deviation should be square root of 2 times bigger than 1 days deviation, but not that much (1.09% to 1.03%, 1.06 x);
  • and 3 days should be square root of 3 times bigger, but the results were 1.25% to 1.03%, 1.21;
  • There are less events and economic news may be behind this;
  • below is the chart for standard deviation.


  • Average index change varies by group;
  • 2 days group's average was too outstanding too ignore;
  • other days figures were hovering around 0%;
  • 3 days group are usual weekend (performance reflects Saturday, Sunday, and Monday's events);
  • 4 days group are basically weekend and holiday falls on Monday.
  • 2 days group are "independent holidays" like new year's day, Independence day, thanksgiving day, and Christmas day.
  • They sound more merrier and that might boosted stock's performance.




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