How to calculate mean and standard deviation
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mohd akmal masud
on 18 Dec 2019
Answered: MD Ashraful Islam
on 27 Jan 2022
Hi everyone, want to ask.
If I have set of data let say
X = [23,43, 45,90,15,41,71,29,45,52,32];
How to calculate the mean and standard deviation?
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Accepted Answer
Star Strider
on 18 Dec 2019
10 Comments
Behzad Hosseinzadeh
on 31 May 2020
the standard deviation of those valuse are 20.386350967869, why MATLAB returns 21.38139?
Image Analyst
on 31 May 2020
As you know, there are two standard deviations
- the standard deviation of the sample
- the standard deviation of the population
If you want the non-default formula, you have to tell it:
X = [23,43, 45,90,15,41,71,29,45,52,32];
sd = std(X) % Default
s0 = std(X, 0)
s1 = std(X, 1)
sd =
21.3813852770029
s0 =
21.3813852770029
s1 =
20.3863509678688
S = std(A,w) specifies a weighting scheme for any of the previous syntaxes. When w = 0 (default), S is normalized by N-1. When w = 1, S is normalized by the number of observations, N. w also can be a weight vector containing nonnegative elements. In this case, the length of w must equal the length of the dimension over which std is operating.
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