remove outlier in large data

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azar mzory
azar mzory 2014-1-10
编辑： azar mzory 2014-4-13
my question how to find outlier in matlab explain by code and example ? and how many methods ? how to find outlier?

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Image Analyst
Image Analyst 2014-1-11
Try this:
% data = the variable name of your array
stdDev = std(data(:)) % Compute standard deviation
meanValue = mean(data(:)) % Compute mean
zFactor = 1.5; % or whatever you want.
% Create a binary map of where outliers live.
outliers = abs(data-meanValue) > (zFactor * stdDev);
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azar mzory
azar mzory 2014-1-12
how i want to check all columns one by one cuz some columns have words should be neglect how many ways to find outlier in big text data ? it is not clear any code
Image Analyst
Image Analyst 2014-1-15
I don't know how to define outliers in text (words). For example, in this comment that you're reading now, which of the words are "outliers" and why?

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