and AB = BA. An example of AB = BA is when both A and B are identity matrices.

4. A row vector postmultiplied by a column vector is a scalar. Thus, consider the ordinary least-squares residuals u 1, u2,..., u„. Letting u be a column vector and u' be a row vector, we have uu uu = [U1 U2 U3

5. A column vector postmultiplied by a row vector is a matrix. As an example, consider the population disturbances of the classical linear regression model, namely, u1, u2,..., un. Letting u be a column vector and u' a row vector, we obtain rui u2


Was this article helpful?

0 0
Budgeting Basics

Budgeting Basics

Get All The Support And Guidance You Need To Be A Success At Budgeting. This Book Is One Of The Most Valuable Resources In The World When It Comes To Get Your Finances In Order Once And For All.

Get My Free Ebook

Post a comment