: p 
Fig. 1 ei» 9 , eg Spaces. 
The metric tensors of the two subspaces can, now, be calculated; using 
(1.7) and (1.8) we obtain. 
T i jT i T T 
& e = TA eeu, - us gU = g 
with 
- pr Go T 
8,08 Zn 
and 
=A S AM = 
8'"a B. 3). ia B "ji a "Bea 
with 
aß = $8 
y qn 8 
The least square estimators for the unknown parameters and observations 
can be obtained from the orthogonal projection of the vector Ax onto 
eg-space. 
The formulae for the different quantities, which will be used later on, 
are reviewed here, their derivations can be found in /1/, /10/. 
Dil) Tim p 
AX 58 4,4 (C Ay 9 
TO 
a . „aß ,j i 
AY, = g Az Bii Ax £1.10) 
i. Xi z36 .d i 
oe As. fo ji M. 
-97 -