1.Track 在这儿啥意思 2.with statistical significance 修饰的是谁?

题目

1.Track 在这儿啥意思 2.with statistical significance 修饰的是谁?
Compared with the initial abnormal returns of IPOs evalued by the first day only in stock market with no daily price limit,the initial abnormal return of Shanghai IPOs should be tracked from the first post-listing day to the last post-listing day consecutively with statistical significance.

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