Why is the mean of value of gaussian white noise not zero?
42 ビュー (過去 30 日間)
I create a vector of randomly selected values from a normal distribution of mean = 0 and std = 1. I calculate the mean and expect as a result zero. And I calculate the mean of the absolute value and I expect as a result but instead I get a non-zero mean and a result of for the mean of the absolute value.
How is that?
Jos (10584) 2019 年 8 月 8 日
The numbers are randomly drawn from a normal distribution. Although this underlyin distribution has a mean of 0 and a standard deviation of 1, this does not mean that your selected numbers should have this mean and standard deviation! Think about it when you draw only a few numbers from this distribution. Would you expect the mean to be 0 all the time?
To make the mean and std of your selection of numbers (almost) equal to 0 and 1, respectively, you can do:
R = randn(1,100) ;
R = (R - mean(R))./ std(R) ;