# Thread: what is the better matrix?

1. ## what is the better matrix?

Hi, I'm just wondering which one is the better covariance matrix..

a) to have one with only numbers along the diagonals
b) to have one with the top diagonal number being greater than the other diagonals (but numbers do not only appear in the diagonals but in the other entries)
c) to have the one with the last diagonal number being greater than the other diagonals (but numbers do not only appear in the diagonals but in the other entries)

I'm thinking, a is best, then b then c.. is this correct?

2. Originally Posted by Dgphru
Hi, I'm just wondering which one is the better covariance matrix..

a) to have one with only numbers along the diagonals
b) to have one with the top diagonal number being greater than the other diagonals (but numbers do not only appear in the diagonals but in the other entries)
c) to have the one with the last diagonal number being greater than the other diagonals (but numbers do not only appear in the diagonals but in the other entries)

I'm thinking, a is best, then b then c.. is this correct?
Define best

CB

3. which one would you choose if you only had to pick one of them?

4. Originally Posted by Dgphru
which one would you choose if you only had to pick one of them?
I would not pick one without knowing what I wanted to do with it.

CB

(Sorry, I couldn't help myself.)

6. okies fair enough then

well my homework was to pick to better design

so i guess i should just figure it out by myself then

7. Originally Posted by Dgphru
okies fair enough then

well my homework was to pick to better design

so i guess i should just figure it out by myself then
Better design for what? The diagonal matrix with all diagonal elements the same would be a better Minimalist design. While either of the other two would be better as Abstract Expressionist designs and given the propensity of galleries to hang these upside down they could be considered the same design.

(you will not get a sensible answer to problems unless you post the entire question and its context)

CB