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wheretis the announcement date. t−3is three days before t. Dis the number of days in the month prior to datet−3. VBj,k,t −3is the buy orders measured in dollars offered for stock j on dayk;andVSj,k,t −3is the sell orders measured in dollars offered forstockj on dayk.An alternative way to computeBSIis to utilize trade orders measured in numbers of shares. The specific formula for the seconddefinition ofBSIis:
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