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- a+b*x ;straight line
- b*x ;line through origin
- 1/(a+b*x) ;reciprocal straight line
- a+b*x+c/x ;linear and reciprocal
- a+b/x ;hyperbola
- x/(a*x+b) ;reciprocal hyperbola
- a+b/x+c/x^2 ;2nd order hyperbolic
- a+b*x+c*x^2 ;parabola
- a*x+b*x^2 ;parabola through origin
- a*x^b ;power function
- a*b^x ;modified power function
- a*b^(1/x) ;square root
- a*x^(b*x) ;super geometric
- a*x^(b/x) ;modified geometric
- a*exp(b*x) ;exponential
- a*exp(b/x) ;modified exponential
- a+b*ln(x) ;logarithmic
- 1/(a+b*ln(x)) ;reciprocal logarithmic
- a*b^x*x^c ;hoerl function
- a*b^(1/x)*x^c ;mod hoerl function
- a*exp(((x-b)^2)/c) ;normal (gaussian)
- a*exp((ln(x)-b)^2/c);log normal
- a*x^b*(1-x)^c ;beta function
- a*(x/b)^c*exp(x/b) ;gamma function
- 1/(a*(x+b)^2+c) ;cauchy function
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