平均數(英文:mean)係統計學上對平均嘅其中一種計法,係一種集中趨勢,亦係日常生活最常用嘅計法。
平均中間化(mean centering):應付多重共線性(睇上面)嘅一種方法;指 foreach 個案,將嗰個個案喺個變數上嘅數值,減個變數嘅平均值,令到成個數據庫喺嗰個變數嘅平均值變成 0 。
呢篇文 需要熟悉呢方面嘅人幫手寫。 |
平均數有好多種,基本概念係多個同一數值嘅數,合計後再用某種反運算得出原本數值。比如有3個一樣嘅數 ,如果用加法合計 ,要計返原來個 就要除以 ,呢個就係算術平均數嘅計法。
嘅算術平均數係 。
嘅幾何平均數係 。
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