How to calculate mean and standard deviation
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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
2019년 12월 18일
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Behzad Hosseinzadeh
2020년 5월 31일
the standard deviation of those valuse are 20.386350967869, why MATLAB returns 21.38139?
Image Analyst
2020년 5월 31일
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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