The percent change is calculated by taking the difference between the most recent time interval and its previous interval and dividing by the previous interval. 

Percent change = (Friday Value - Thursday Value) / (Thursday Value)

This percent change depends on what your display increment is set to under Chart Options.  If display increment is set to "daily," percent change is calculated by using the most recent day and the day before. If display increment is set to "weekly," percent change is calculated by using the most recent week and the previous week... and so on. 

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