How do I confront the outliers from two different methods?

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HelpAStudent 2022-5-17

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https://ww2.mathworks.cn/matlabcentral/answers/1721120-how-do-i-confront-the-outliers-from-two-different-methods

评论： Mathieu NOE 2022-5-17

Hi! I have used two different methods to remove outliers from a certain data set. Here they are below:

%Grubb's test 
figure;
plot(Fetal_table.mean_value_of_short_term_variability) %Fetal_table is my table with all the features in it and mean_value_of_short_term_variability is the gaussian feature in which I want to delete the outliers
histogram(Fetal_table.mean_value_of_short_term_variability)
figure;
vec_out = isoutlier(Fetal_table.mean_value_of_short_term_variability,"grubbs");
figure; 
plot(Fetal_table.mean_value_of_short_term_variability, "og"); hold on; 
Fetal_table(vec_out,:)=[]; 
%Box plot rule 
figure;
plot(Fetal_table.mean_value_of_short_term_variability) %Fetal_table is my table with all the features in it and mean_value_of_short_term_variability is the gaussian feature in which I want to delete the outliers
histogram(Fetal_table.mean_value_of_short_term_variability)
figure;
vec_out = isoutlier(Fetal_table.mean_value_of_short_term_variability,"quartile");
figure; 
plot(Fetal_table.mean_value_of_short_term_variability, "og"); hold on; 
Fetal_table(vec_out,:)=[]; 

How can I compare if the same outliers have been removed and if different ones have been removed, understand which ones and understand which method is the most effective?

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Mathieu NOE 2022-5-17

在 MATLAB Online 中打开

hello

what do you mean by "compare" ? want just to plot the selected outliers ? visual check or more advanced computations ? below I simply overlay the data and the outliers - we could also make one single plot with both sets of outliers

also the variable name is quite long and make the code less readable as you repeat it quite often , why not make it simpler like :

data = Fetal_table.mean_value_of_short_term_variability;
%Grubb's test 
figure;
plot(data) %Fetal_table is my table with all the features in it and mean_value_of_short_term_variability is the gaussian feature in which I want to delete the outliers
histogram(data)
figure;
vec_out = isoutlier(data,"grubbs");
data_out = Fetal_table(vec_out,:);
figure; 
plot(data, "og"); hold on; plot(data_out, "or");
% data_out=[]; % optional
%Box plot rule 
figure;
plot(data) %Fetal_table is my table with all the features in it and mean_value_of_short_term_variability is the gaussian feature in which I want to delete the outliers
histogram(data)
figure;
vec_out = isoutlier(data,"quartile");
data_out = Fetal_table(vec_out,:);
figure; 
plot(data, "og"); hold on; plot(data_out, "ok");
% data_out=[]; % optional