# Matrix GLM estimation Example Explanation

**Below is my question:

It is an example from the book " A Primer on linear modes" by Monahan**

I have 3 questions

Question 1:

is how did he calculated the matrix λ

Question 2:

Why $$λ$$ it is not in $$C$$( $$X^T$$)

Question 3:

How do we know that specifically $$α_1$$ is non-estimable and not $$a_2$$