Model 1 

Diagnostic tests  Test statistic 
Serial correlation  F = 0.0429 (0.838) 
Normality test  χ^{2} (Chisquare) = 3.372 (0.185) 
Heteroscedasticity  F = 0.962 (0.531) 
Model 2 

Serial correlation  F = 0.0619 (0.415) 
Normality test  χ^{2} (Chisquare) = 5.087 (0.335) 
Heteroscedasticity  F = 0.931 (0.510) 