Figure 11  October CET predictions of multiple regression model using October P, S  & C indices for period used to
develop model (1881-1970) and for 1971-2003 compared with observed October CET 1881-2003 and the model
errors (observed - predicted CET).

Equation: Oct CET = 9.379 + (0.01047 x Oct P) + (0.07056 x Oct S) + (-0.00191 x Oct C) which explains 41% of variation in Oct CET.