用流動人口為由而放棄，是庸人懶人態度。現在追蹤+曆史多方麵數據，交叉驗證是可以去掉大部噪音，得到更可靠的估計的。

來源: 十具於 2021-12-18 08:35:17 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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