MATLAB: Removing outliers using standard deviation

Question

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:

rmoutliers(A,'mean');

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!

Answer 1

groupfilter does the trick

cleanTable = groupfilter(yourTable, 'Hour', @(x)~isoutlier(x, 'mean'), 'Price');