i c. I thought it is just based on mean and SD, which

来源: Smart 于 2017-12-24 22:46:23 [] [旧帖] [给我悄悄话] 阅读数 : (39 bytes)
本帖于 2017-12-24 22:46:57 时间, 由普通用户 Smart 编辑

makes sense to me very much.

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