Only abnormally large outlier values are removed, not small ones

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Lina Koronfel
Lina Koronfel on 26 Mar 2022
Commented: Image Analyst on 26 Mar 2022
I used the rmoutlier function to remove outliers from a dataset but it only removed the abnormally large value, not the abnormally small one. Please see figure for reference. Also I used the following line of code:
[Array_wo_outliers(1,:), TF]=rmoutliers(Array_Original(1,:),'mean');
How can I remove both???
Thank you

Answers (1)

AndresVar
AndresVar on 26 Mar 2022
your data has zeros that make the mean closer to the small peak.
you should ignore the zeros, maybe you can throw them away OR you can try setting them equal to the non-zero data mean.
load('testdatarmoutlier.mat')
ind0 = y==0; % where are the zeros
meannz = mean(y(~ind0)); % mean of non-zero data
figure;
plot(x,y,'rx')
yline(mean(y),'k',Label='mean (close to bottom!)')
yline(meannz,'k',Label='mean ingnore zeros')
y(ind0)=meannz; % make zeros equal to the non-zero data mean
[y2,ind]=rmoutliers(y,'mean');
y(ind0)=0; % restore zeros
figure;
plot(x(~ind),y(~ind),'x')
  1 Comment
Image Analyst
Image Analyst on 26 Mar 2022
or threshold
threshold = 0.5;
y(y < threshold) = []; % Remove all values less than the threshold

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