In general, the validity of the model could be judged by the lack of fit to check the adequacy of the model (Table 2). The P-value of the model was significant (P < 0.05) while the lack of fit value of the model was 0.9039 (P > 0.05, not significant). Both the values indicated that the model developed for lycopene yield prediction exhibited a good fit. Also, a good agreement with the experimental results for the coefficient (r2) of 0.9834 was found.