- 匿名使用者2 0 年前最佳解答
3. 局外人;門外漢參考資料： 上網查詢
- 2 0 年前
|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.
- miniLv 52 0 年前
2004-12-31 17:30:27 補充：
Sorry, shall I make it up to you? ^^
- 匿名使用者2 0 年前