# How to calculate skewness & kurtosis ?

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Mr LE 2015 年 2 月 1 日
コメント済み: SUBHASMITA DASH 2022 年 5 月 31 日
Hi,
I would like to calculate the third and fourth moment with returns data (matrix 1x132)
Do you know the function that can I use for that?
Thanks!
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SUBHASMITA DASH 2022 年 5 月 31 日

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### 回答 (2 件)

Star Strider 2015 年 2 月 1 日

If you have the Statistics Toolbox, you can calculate the skewness and kurtosis directly with their respective functions.
If you don’t have the Toolbox, it would be relatively easy to code those functions:
skewns = @(x) (sum((x-mean(x)).^3)./length(x)) ./ (var(x,1).^1.5);
kurtss = @(x) (sum((x-mean(x)).^4)./length(x)) ./ (var(x,1).^2);
These work for numeric vectors.
P.S. — Are your data double arrays or cells? If cells, you’ll likely have to use cellfun or cell2mat to work with any of these functions.
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Star Strider 2022 年 2 月 11 日
Perhaps evaluating the functions with an argument vector would work?
skewns = @(x) (sum((x-mean(x)).^3)./length(x)) ./ (var(x,1).^1.5);
kurtss = @(x) (sum((x-mean(x)).^4)./length(x)) ./ (var(x,1).^2);
x = randn(1, 5000);
sk = skewns(x)
sk = 0.0412
kt = kurtss(x)
kt = 3.0302
.

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Image Analyst 2015 年 2 月 1 日
I have code where I do it from the histogram. You could easily adapt it to handle data not from a histogram. See the function at the bottom of the attached file. Let me know if you can't figure it out.

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