Only abnormally large outlier values are removed, not small ones

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

Answer 1

[AndresVar]

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')

[Image Analyst]

or threshold

threshold = 0.5;
y(y < threshold) = []; % Remove all values less than the threshold