Table 1.

Regression model by stepwise regression

Model	R	R2	Adjusted R2	Standard error
1	.850	.723	.723	11.0025
2	.860	.739	.738	10.6892
3	.865	.749	.747	10.5123
4	.868	.753	.751	10.4356

Note: a. variable in modle1: (Constant), I1;

b. variable in model 2: (Constant), I1, T_mean0;

c. variable in model 3: (Constant), I1, T_mean0, T_mean01;

d. variable in model 4: (Constant), I1, T_mean0, T_mean01, R_mean0;

e. Dependent Variable: I_o