SEMAINE D'ÉTUDE SUR LE ROLE DE L ANALYSE LCONOMETRIQUE ETC. 
47 
then it follows from (2.0) that y, is determined as follows: 
(3.2) V; - 
- bx,+ (b+1/6)x, 1 -v. a 
We consider the sum of squares of the y,’s over a period of 
T years, where T represents the horizon which the decision 
maker takes into account. It will prove useful to introduce a 
matrix notation to handle all years simultaneously: 
3.3) 
then (3.2) for t=, ..., 
(3.4) 
! can be written in the form 
Ex+s. 
where 
3-5) 
7 
Theil - pag.