Parametric and Nonparametric Approaches of Reid Vapor Pressure Prediction for Gasoline Containing Oxygenates: A Comparative Analysis Using Partial Least Squares, Nonlinear, and LOWESS Regression Modelling Strategies with Physical Properties

Table 1

Descriptive statistics of 913 GOB samples used for RVP prediction using PLS, NLR, and NPR regression models.

Parameter	Min.	Max.	1st quartile	Median	3rd quartile	Mean	Standard deviation ()	Sample counts
RVP (kPa @ 37°C)	38.70	75.30	51.70	56.40	61.60	56.62	6.47	913
S-Dens (g/cm^3 @ 15°C)	0.71	0.76	0.73	0.73	0.74	0.73	0.01	913
IBP (°C)	28.70	64.10	35.50	36.90	38.60	39.28	7.25	913
T10 (°C)	20.80	60.80	44.90	46.40	47.80	44.64	6.12	913
T50 (°C)	34.90	111.30	86.40	89.70	93.10	86.38	13.00	913
T90 (°C)	134.40	191.40	152.50	155.40	161.60	158.15	9.29	913
FBP (°C)	163.40	212.60	184.20	187.90	190.40	186.28	7.42	913
MTBE (Vol.%)	0.13	23.5	1.780	4.34	7.130	5.541	4.399	445
ETBE (Vol.%)	0.95	9.85	1.050	1.07	1.100	1.362	1.428	186
TAME (Vol.%)	0.8	7.63	1.058	1.33	2.003	1.725	1.316	28
Methanol (Vol.%)	0.32	25.1	1.283	4.95	10.648	7.366	7.849	82
Ethanol (Vol.%)	0.6	24.1	3.080	3.42	4.150	3.544	1.233	467
Oxygenates (Vol.%)	1.26	29.9	3.150	4.55	5.520	5.585	4.455	913