Table 3.

Measuring the performance statistics, prediction, and the actual response of BBD and ANN models for melanin production by A. pullulans AKW.

Model		R2	RASE	AAE	Frequency
Training	BBD	0.9845	0.2609	0.1905	10
	ANN	0.9857	0.2506	0.1607	10
Validation	BBD	0.9933	0.1034	0.0921	5
	ANN	0.9935	0.1016	0.0868	5
Overall	BBD	0.9871	0.2212	0.1577	15
	ANN	0.9881	0.2128	0.1360	15

Variable	Predicted value
	BBD	ANN
Predicted optimum conditions
Tyrosine (%)	0.299	0.329
Sucrose (%)	5.168	4.870
Incubation time (h)	145.825	167.994
Validation of response
Predicted melanin production (g/L)	10.554	10.286
Experimental melanin production (g/L)	9.295 ± 0.556	10.192 ± 0.782

RASE root average squared error, AAE average absolute error.