[問題] ANOVA 有常態分佈的假設嗎?
我想知道我有 n > 100 的資料,
(EDIT: 實際數目為四組, 數目分別為 509, 237, 168, 63)
Normality test (Anderson–Darling) 得知分佈非常態 (很多是零)
我想分析的資料有兩個 independent variables,
如果是常態其實我就可以用 ANOVA 直接檢定。
但現在它是非常態我就有點疑惑。
我想問 ANOVA 有常態分佈的 assumption 嗎?
因為 t-test 有原始資料呈常態分佈的假設,我以為 ANOVA 為
t-test 對多個 sample 的 "擴充" 所以也有這個假設有,但是我的書
似乎沒有寫得很清楚。 Wikipedia 上面則說: "Normality – the
distributions of the residuals are normal."
我一直以為 ANOVA 有原始資料(非 residuals) 須呈常態分佈的假設
所以才會須要 Kruskal-Wallis test 等無母數的 "one-way ANOVA" test。
所以我的問題是:是原本資料就要成常態,還是 residual 才要是常態?
還是這兩者之間有一定的關係? 原始資料非常態的時候會直接代表
residual 沒有常態嗎?還是要真的做過 regression才知道?
Edit 補充:我上面指的 "原始資料" 是我的 samples,並非母體
另外我現在覺得因為我的n>100所以可以適用中央極限定律(對吧?)
但我還是想問 ANOVA residual normality assumption 的問題.
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