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Table 3

Form of curve estimation model

Model nameModel expression
Linear function of one variable Y = b0 + b1x 
Quadratic function Y = b0 + b1x + b2×2 
Composite function Y = b0(b1)x 
Growth function  
Logarithmic function Y = b0 + b1lnx 
Cubic function Y = b0 + b1x + b2×2 + b3×3 
S curve  
Exponential function  
Inverse function Y = b0 + b1/x 
Power function  
Logic function Y = (1/u + b0b1x)−1 
Model nameModel expression
Linear function of one variable Y = b0 + b1x 
Quadratic function Y = b0 + b1x + b2×2 
Composite function Y = b0(b1)x 
Growth function  
Logarithmic function Y = b0 + b1lnx 
Cubic function Y = b0 + b1x + b2×2 + b3×3 
S curve  
Exponential function  
Inverse function Y = b0 + b1/x 
Power function  
Logic function Y = (1/u + b0b1x)−1 
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