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                ## 5.6 模式 有時,我們希望描述非數字數據集的中心趨勢。例如,假設我們想知道哪種型號的 iPhone 最常用。假設我們問一組 iPhone 用戶他們擁有哪種型號,并得到以下結果: ```r # compute mean of iPhone model numbers iphoneDf <- tribble( ~iPhoneModel, ~count, 5, 325, 6, 450, 7, 700, 8, 625 ) meanPhoneNumber <- iphoneDf %>% summarize( sum(iPhoneModel * count) / sum(count) ) %>% pull() ``` 如果我們取這些值的平均值,我們會發現平均的 iPhone 型號是 6.77,這顯然是無稽之談,因為 iPhone 型號是按順序排列的。在這種情況下,對集中趨勢更合適的度量是模式,這是數據集中最常見的值,正如我們前面討論的那樣。
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