# Thread: expected value of matrices

1. ## expected value of matrices

Dear all,

Assume X= $\left(\begin{array}{ccc}X_{11} & X_{12} & X_{13} \\ X_{21} & X_{22} & X_{23} \\ X_{31} & X_{32} & X_{33}\end{array}\right)$

How to find E(X)? where E is expected value.

2. Originally Posted by atlove
Dear all,

Assume X= $\left(\begin{array}{ccc}X_{11} & X_{12} & X_{13} \\ X_{21} & X_{22} & X_{23} \\ X_{31} & X_{32} & X_{33}\end{array}\right)$

How to find E(X)? where E is expected value.
Read item 6 in this reference: Expected value - Wikipedia, the free encyclopedia

3. Originally Posted by mr fantastic
If one of the entry of E(X) is E(11), then what will be the value of E(11)?

4. Originally Posted by atlove
If one of the entry of E(X) is E(11), then what will be the value of E(11)?
Expected value of a constant is the constant.
So, do you mean E(X) =11 ?

5. Originally Posted by matheagle
Expected value of a constant is the constant.
So, do you mean E(X) =11 ?
thank you~

is there any meaning of the expected value of a constant?

6. Originally Posted by matheagle
Expected value of a constant is the constant.
So, do you mean E(X) =11 ?
suppose all the entries in matrix X are const.
if E(X)=X, then X-E(X)=0?