平均访问次数（Visits per Visitor）是指在一定期间内，平均每个用户的访问次数。 计算方法是用指定期间内的总访问数除以此期间内的唯一访问者（Unique Visitor）数。
计算平均网站停留时间，谷歌分析划分的总时间为所有的访问的访问次数。
To calculate Average Time on Site, Google Analytics divides the total time for all visits by the number of visits.
该算法从改变表的操作顺序及修改孔雀哈希数据结构着手，保证了片外访问的平均次数接近于1。
This algorithm ensured the average times of off-chip access close to 1 through changing the operating sequence and data structure of peacock hash.
在每个节点，计算值是每个孩子节点按访问次数的加权平均值。因为访问次数取决于估值和估值的可信度两者的差异。
Then the value is a smoothed estimation of max, as the frequency of visits depends on the difference between the estimated values and the confidence of this estimates.
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