prctile how to calculate

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peter huang 2021-12-29

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1619220-prctile-how-to-calculate

评论： Star Strider 2022-1-7

采纳的回答： Star Strider

first of all , my english is not very good if there are many grammatical errors , please include it .

hi,

i don,t know about the method described in the matlab manual for prctile calculation

can you use a set of simple data to explain how the percentile value is calculated?

many thanks

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Rik 2021-12-29

Do you mean you want to know how to use the prctile function with your data?

If not, why do you want to know how it works? Do you want to write your own version?

peter huang 2021-12-29

Yes, i want to know how prctile calculated the quartiles

ex:

s = [1 2 3 4 5 6 7 8 9 ]

Q1 = prctile(s, 25) % 第一四分位

mean = prctile(s, 50)

Q3 = prctile(s, 75)

Q1 = 2.75 Q3 = 7.25

how did Q1 come

is there any formula?

i need to use my paper

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Star Strider 2021-12-29

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1619220-prctile-how-to-calculate#answer_864415

See the prctile documentation section on Algorithms.

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Star Strider 2021-12-30

@Rik — Thank you!

@peter huang —

See the discussion under Linear Interpolation.

The documentation explains it better than I can.

Star Strider 2022-1-7

@peter huang —

My pleasure!

If my Answer helped you solve your problem, please Accept it!

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