A letter of recommendation from two associate professors, experts, or scholars with equal title.

两名副教授或相当职称以上专家、学者的推荐信。

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In 2010, Johan Bollen, an associate professor at Indiana University and two other professors published research showing how using Twitter could with more than 85% accuracy predict the daily up and down readings of the Dow.

WSJ: In the Wired World, Feeds Drive Trading