How to find points 3 std away from the mean in vector
14 views (last 30 days)
Show older comments
Hello,
Could you please help me to find a way how to find the points which are 3 std away from the mean in vector?
0 Comments
Accepted Answer
Image Analyst
on 9 Sep 2014
Edited: Image Analyst
on 9 Sep 2014
Assuming you really mean " more than 3 standard deviations away from the mean"...
% Get the mean and standard deviation of the vector
theMean = mean(yourVector);
stdDev = std(yourVector);
% Get a logical vector of the locations where the value is more than 3 sd away from the mean.
locationsAwayFromMean = abs(yourVector - theMean) > stdDev;
% Extract only those elements
outlierValues = yourVector(locationsAwayFromMean);
4 Comments
Filippe Frulli
on 19 Aug 2020
Edited: Filippe Frulli
on 19 Aug 2020
May I please ask how exactly is the 3*standard deviations calculated?
Based on my interpretation of Image Analyst's solution, I only see 1 standard deviation being calculated. I would really appreciate clarification.
Shouldn't it be
locationsAwayFromMean = abs(yourVector - theMean) > 3*stdDev?
More Answers (0)
See Also
Categories
Find more on Elementary Math in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!