Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

I would like to ask about first central moment. E(X-E(X)) if X is vector with n-dime

  1. Mar 28, 2008 #1
    where X ~ N (μ, σ2)

    I know that if X is random variable, the first central moment E(X-E(X)) = E(X-μ) is zero. But I would like to know if X and μ is vector. For example if X = [x1 x2] and μ = [μ1 μ2]. What is the value of E(X-μ)?



    Thank you
     
  2. jcsd
  3. Mar 28, 2008 #2
    It's still zero, although now it's a vector of zeros. To see this, simply evaluate it component-wise and apply the scalar result you started with.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: I would like to ask about first central moment. E(X-E(X)) if X is vector with n-dime
  1. Solution of e^x = x (Replies: 17)

  2. [itex]e^{x} > x[/itex] (Replies: 1)

  3. ∫ e^(x^x) dx (Replies: 10)

Loading...