Bad Tick Correction Using a Holiday

Occasionally, an exchange will send a price down on the weekend. Sometimes the price is out of range and causes a bad tick to appear on daily and weekly charts. This phenomenon is easy to identify. If a bad tick on a daily chart registers on a Monday or a Friday, the incorrect price probably is the result of a weekend transmission.

Unfortunately, you cannot correct a bad tick that occurred on a weekend, for daily charts do not display Saturdays and Sundays. To correct a bad tick that occurred on a weekend, therefore, you must make the weekend dates holidays.