How to filter out 1sigma data

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Mekala balaji 2017-9-18

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https://ww2.mathworks.cn/matlabcentral/answers/357186-how-to-filter-out-1sigma-data

评论： Star Strider 2017-9-18

Hi,

I have below data:

I want to filter-out the data which is >1sigma values (if 1sigma is standard in Matlab, using that function), if there is no such standard, then 1sigma is by 1sigma mean value.

my desired output:

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Answer 1

Star Strider 2017-9-18

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https://ww2.mathworks.cn/matlabcentral/answers/357186-how-to-filter-out-1sigma-data#answer_282064

在 MATLAB Online 中打开

I can’t produce your desired output, since that does not match the criterion of data being less than 1 standard deviation of the mean:

v = [1.02 
    1.06 
    1.10 
    1.06 
    1.02 
    1.05 
    1.12 
    1.50 
    1.01];
vm = mean(v);
vs = std(v);
v_result = v(v < vm+vs);

The mean+std value is 1.2573, so only 1.50 fails to meet the criterion.

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Mekala balaji 2017-9-18

I also want the row index of outliers

Star Strider 2017-9-18

在 MATLAB Online 中打开

If you set 1 sigma (standard deviation) as the criterion, then none are acceptable, since the standard deviation is 0.1528. All the values are above that.

The row index of the outliers is easy:

outlier_idx = find(v >= vm+vs);

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