请问个retail的问题

repeat rate 和 retention 怎么区分呢？有人知道吗？一家luxury store列了这两个数据， 有点不明白

T&R里，repeat rate就是在一定时间内 #repeats/#trials repetition 不熟，至少不是我所在行业的术语，我猜是# repeats? 有trial数据的话，算一下就知道了。

Repeat Rate= # of Customers That Purchased More Than Once / # Unique Customers Retention Rate = (# Customers at End of Period - # Customers Acquired During Period) / # Customers at Start of Period