# 「去極值」的英文？

「去極值」的英文為何？

### 5 個解答

• 匿名使用者
2 0 年前
最佳解答

「去極值」的英文應該是outlier。

outlier的基本意思是：

1. 離開本體的部分;分離物

2. 露宿者

3. 局外人;門外漢

參考資料： 上網查詢
• 2 0 年前

這個應該是absolute value吧？數學符號表達為：

|5| = |-5| = 5

• 2 0 年前

I also think that it's outlier. Let me interject some of my thoughts on this.

It is used to filter out hte noise in the data. You can set different threshold for your outlier filter. Usually it is using standard deviation (sigma) as a way to gauge the validity of the data. because you don't want the noise to throw your calculation off.

The statistical normal distribution would usually give you a gaussian bell curve.

At the top of the curve, that's the mean value.

mean value +- 1 sigma from each side(2 sigmas) would cover about 68% of the data (don't remember the exact number on top of my head)

mean value +- 2 sigmas from each side(4 sigmas) would cover about 95% of the data

mean value +- 3 sigmas from each side(6 sigmas) would cover about 99% of the data

So usually you can set if the data is beyond +- 2 or 3 sigmas then you would thow it out to prevent the statistical noise affecting the result. Then you would used the remaining data set to calculate the mean value again to get a more precise

Kurtosis is another important value to look at when you are determining the outlier data.

2004-12-31 03:33:48 補充：

ibuki, no, it's not abs value.

Mini, but OJ's definition is not mathematical. I gave you the precise answer... well, anyway, what is done is done.

2005-01-01 05:21:13 補充：

Hmmm... I am sure you will come up with some way to make it up to me... heheh ;)

參考資料： Well, I used it when I was a research engineer.
• mini
Lv 5
2 0 年前

我想知識+設計分類的人跟我一樣不喜歡數學，所以沒有這一項...

2004-12-31 17:30:27 補充：

Sorry, shall I make it up to you? ^^

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• 匿名使用者
2 0 年前

因為它不是一般人會常接觸的專業詞語，

建議把這題改放到數學類..

不過目前好像沒有這一類..

看是放資訊或金融類，

看過相關原文數學書者比較可能知道。