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the mean and std value of a standard normal distribution

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yue li
yue li 2018-8-28
评论： yue li 2018-8-28
Hello,
I used matlab example https://www.mathworks.com/help/stats/normal-distribution.html
Compute the pdf of a standard normal distribution, with parameters µ equal to 0 and σ equal to 1. The mean value of norm should be 0, and the std value of norm should be 1.
Why the mean value of norm is 0.1636, and the std value is 0.1408?
Thanks in advance!
Yue
x = [-3:.1:3];
norm = normpdf(x,0,1);
>> norm_mean=mean(norm)
norm_mean =
0.1636
>> norm_std=std(norm)
norm_std =
0.1408
  2 个评论
Adam
Adam 2018-8-28
You are taking the mean and std of the values on the y axis of the pdf, not the x axis, which is a fairly meaningless statistic.
yue li
yue li 2018-8-28
编辑：yue li 2018-8-28
Hello, Adam,
Thank you so much for your great help!
Yue

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采纳的回答

Image Analyst
Image Analyst 2018-8-28
norm() is a built-in function so don't use that for your variable name.
Try using randn() and then using mean() and std() on that.

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