Adding outlier to a matrix

9 次查看（过去 30 天）

Niki 2014-5-22

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/130639-adding-outlier-to-a-matrix

评论： Star Strider 2014-5-22

Hi , I have a matrix of intensities (n*p). I want to add an outlier to it. Do you have any idea about how to simulate an outlier? I was thinking to take the mean of matrix and then multiply it to some very high value?

Do you have any idea ?

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

Star Strider 2014-5-22

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/130639-adding-outlier-to-a-matrix#answer_137830

在 MATLAB Online 中打开

I suggest:

M = rand(4,5);                      % Create data
Msts = [mean(M(:))  std(M(:))];  
Outlier = Msts(1)+5*Msts(2);

Define the outlier by a multiple of the standard deviation from the mean. An value of 5*std is quite far out.

8 个评论
显示 6更早的评论隐藏 6更早的评论

Niki 2014-5-22

Not that one but this one helps

OutsXR = mean(X,1) + 5*std(X,[],1);

however, I accept your answer Thanks

Star Strider 2014-5-22

My pleasure, and thanks!

请先登录，再进行评论。

更多回答（1 个）

Roger Wohlwend 2014-5-22

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/130639-adding-outlier-to-a-matrix#answer_137831

Actually you answered your question yourself. Instead of the mean I would use the maximum value of the matrix. Multiply that number by a certain value. That's all. It is quite easy.

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Niki 2014-5-22

In fact, I want to know whether it is scientifically correct or not? It is not a number. As I explained it is a matrix of n*p so I wont have a value as outlier but a row which corresponds as an outlier

On the other hand, do you know any way to show it as a outlier ?

请先登录，再进行评论。

请先登录，再回答此问题。