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Mariana asked . 2023-03-14

How to use isoutlier based in a part of the data?

I have a vector of datas. Like this,
 
a =[0;0.0028;0.0002;0.0039;0.0061].
 
As you see, since the 4° element, the values start growing more until the end.
 
I was trying to determine a threshold to define the 4° and 5° elements as ouliers using 'isoutlier' function from Matlab. I did it. But I had to define a fixed 'ThresholdFactor'value using one of the methods the function has.
 
I would like the 4° and 5° values to being identified as outliers. Not based with all the vector datas, but because they are bigger than the 1°, 2° and 3° elements. I mean, I would like to find the outliers based on the backforward datas [0;0.0028;0.0002].
 
The vector I posted is an example. The size must be generic.
 
Can you help me?
 
P.S. (Actualized): As I said, depending of the data entries, my vectors gonna have different sizes. But in all cases, the phenomenum they represent, makes the vector values would be bigger at the end.
 
I can't find a way to define when the datas gonna be outliers since the vector will not always be the same. I need to generalize. So what I really need is to identify when the values start growing until reach the end. For instance, for my example, it would happen from the 4° position.

isoutlier , threshold , outliers , Resizing and Reshaping Matrices , MATLAB , Language Fundamenta

Expert Answer

John Williams answered . 2024-05-20 13:33:03

hello
 
why not using islocalmin ? seems to me what you want is to keep the first 3 points (corresponding to a local min).
a =[0;0.0028;0.0002;0.0039;0.0061];
id = find(islocalmin(a(1:end)));
a_keep = a(1:id)
a_keep = 3×1
         0
    0.0028
    0.0002
plot(a)
hold on
plot(a_keep,'dr')

use isoutlier based in a part of the data


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