AARD%	Average absolute relative deviation percent
AI	Artificial intelligence
ANN	Artificial neural networks
CFNN	Cascade feedforward neural networks
CSTR	Continuously stirred tank reactors
EIX	Ethylene index
HDPE	High-density polyethylene
MLP	Multi-layer perceptron
MLPNN	Multi-layer perceptron neural networks
MSE	Mean squared errors
RBF	Radial basis neural networks
RMSE	Root mean square errors
R2	Regression coefficient
TEA	Triethylaluminium