How to calculate mean and standard deviation

664 次查看（过去 30 天）
mohd akmal masud
mohd akmal masud 2019-12-18
回答： MD Ashraful Islam 2022-1-27
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?

请先登录，再回答此问题。

采纳的回答

Star Strider
Star Strider 2019-12-18
Mean: mean
Standard Deviation: std
  10 个评论
显示 8更早的评论
Behzad Hosseinzadeh
Behzad Hosseinzadeh 2020-5-31
the standard deviation of those valuse are 20.386350967869, why MATLAB returns 21.38139?
Image Analyst
Image Analyst 2020-5-31
As you know, there are two standard deviations
  1. the standard deviation of the sample
  2. 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.

请先登录，再进行评论。

更多回答（1 个）

MD Ashraful Islam
MD Ashraful Islam 2022-1-27
mean(X)
std(X)

类别

在 Help Center 和 File Exchange 中查找有关 Image Category Classification 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by