SEMAINE D’ETUDE SUR LE ROLE DE L ANALYSE ECONOMETRIOUE ETC 
r — 
Si 
Nonstochastic variables subject to observational erro: 
a)-b) Same variables as in Fig. 2 a-b 
the deterministic situation does not extend to the inference (40, 
for the stochastic situation. or more generally, 
(AI) 
HEl[a "FE ' 
that is, the expectation of a nonlinear function f(x) will only ... 
exceptional cases equal the function of the expectation. 
Turning now to bivariate relationships, Figs. 2b and 
refer to BOYLE’s law 
2u 
(42, 
FIG. 4 - Stochastic variables subject to exact observation. a) Moleculas 
weight of nylon. b) Consumer demand v as function of market price 
x. 
21 Wold - pag. 23