How to calculate mean and standard deviation
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mohd akmal masud
le 18 Déc 2019
Réponse apportée : MD Ashraful Islam
le 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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Star Strider
le 18 Déc 2019
10 commentaires
Behzad Hosseinzadeh
le 31 Mai 2020
the standard deviation of those valuse are 20.386350967869, why MATLAB returns 21.38139?
Image Analyst
le 31 Mai 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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