When I use quartile filter to remove outliers, how can I analitically express the thersehold factor? By default is 1.5, i need to know what rapresent thereshold factor of 4

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Gaetano Mannino 2022-7-14

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https://ww2.mathworks.cn/matlabcentral/answers/1759855-when-i-use-quartile-filter-to-remove-outliers-how-can-i-analitically-express-the-thersehold-factor

编辑： Jonas 2022-7-14

% Remove outliers

[PV52021_nG_clPR,outlierIndices] = rmoutliers(PV52021_nG,"quartiles",...

"ThresholdFactor",4);

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Gaetano Mannino 2022-7-14

thanks exactly, i would like to knoow how "upper and lower limits" are calculated to understand what happens changing the value of the thereshold factor (it can be 4 like the example or another value)

Jonas 2022-7-14

编辑：Jonas 2022-7-14

在 MATLAB Online 中打开

someData=randn(10000,1)+randi(10);
quartiles=quantile(someData,[0.25 0.75]);
iqr=diff(quartiles);
factor=4;
upperBorder=quartiles(2)+factor*iqr
upperBorder = 16.0464
lowerBorder=quartiles(1)-factor*iqr
lowerBorder = 3.9419