Removing outliers using standard deviation

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Angelavtc on 17 Feb 2021
Commented: Angelavtc on 19 Feb 2021
Hello everyone,
I have a timetable of 8764*3. The first column corresponds to the date, the second to the hour (which goes from 1 to 24 in double format) and the third is a price. My objective is that, for each hour, I remove the prices that are above (Mean of that hour + 3*SD of the prices of that hour) and any price below (Mean of that hour - 3*SD of the prices of that hour). I know I could use the code:
However, this filter would take into account all the hours of the sample. Could someone kindly help me to apply it for each hour?
I attach here the data so you can have a clear view of what I have.
Thank you!

Accepted Answer

Ive J
Ive J on 18 Feb 2021
groupfilter does the trick
cleanTable = groupfilter(yourTable, 'Hour', @(x)~isoutlier(x, 'mean'), 'Price');

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