Nelder & Wedderburn 1972- GLM- Sufficient Statistics - Show the sum of z*x are sufficient statistics

Описание: Please follow along by reading the paper: https://www.jstor.org/stable/2344614?....
Here is the link to my complete playlist regarding this paper:    • Nelder & Wedderburn 1972 - Generalized Lin...  
In this video I discuss the following sentence "From the expression for L we see that the quantities sum Z_k * X_ik are a set of sufficient statistics."