Table VII.

Evaluation of the NF-FF model using ASTM 5157 Criteria. Acceptable values or ranges are shown in parentheses. NMSE: Normalized Mean Square Error; FB: Fractional Bias

NF-FF Model Performance Evaluation
ASTM 5157 Criteria	Solvent
	Toluene		2 Butanone		Acetone
Correlation coefficient, r (≥ 0.9)	NF	FF	NF	FF	NF	FF
Mean	0.95	0.99	0.91	0.91	0.93	0.91
% acceptable	81%	100%	67%	99%	99%	100%
Slope, b (0.75 – 1.25)
Mean	1.01	1.26	0.93	1.12	0.9	0.94
% acceptable	89%	69%	96%	91%	81%	97%
Intercept, a (≤ 25% C average)
Mean	25.1	3.39	33.8	−1.5	54.6	3.51
% acceptable	44%	100%	19%	98%	11%	100%
NMSE (≤ 0.25)
Mean	0.18	0.11	0.2	0.06	0.23	0.03
% acceptable	89%	99%	78%	94%	94%	96%
FB (≤ 0.25)
mean	0.36	0.24	0.35	0.01	0.42	−0.06
% acceptable	33%	75%	26%	93%	15%	100%
Acceptable (all criteria)	33%	69%	19%	91%	11%	96%