In general what is the expectation of the sum of yi minus ybar squared

is this the same as the sum of of VAR(Y)?

Printable View

- Nov 5th 2013, 12:16 AMkingsolomonsgravethe expectation of the sum of yi minus ybar squared
In general what is the expectation of the sum of yi minus ybar squared

is this the same as the sum of of VAR(Y)? - Nov 5th 2013, 03:50 PMchiroRe: the expectation of the sum of yi minus ybar squared
Hey kingsolomonsgrave.

What do you mean by sum of Var[Y]? Can you write it out in terms of sigma notation and expectation/variance of random variables? - Nov 6th 2013, 11:15 AMkingsolomonsgraveRe: the expectation of the sum of yi minus ybar squared
var(Y) in terms of expectation is

and

- Nov 6th 2013, 01:49 PMchiroRe: the expectation of the sum of yi minus ybar squared
This looks right and remember also that expectation is linear so if you have a sigma inside the expectation, you can take it outside the expectation as well.