Regression functions
There is a complete list of the functions currently available for non-linear regression.
This button on the graphics page will bring up the Function List selection page:
Linear: Simple linear function.
Poly2: Second-order polynomial.
PolyAB: Second-order polynomial with y-intercept = zero.
Poly3: Third-order polynomial.
Lowess: Lowess is a alternative fitting method that does not require a standard mathametical function, there it is non parametric. For more details see the separate LOWESS page
Log: Logarithmic equation with baseline A.
Exp: Exponential function with Y intercept = zero.
Power: Power function with Y intercept = zero.
Michaelis: Used in enzyme kinetics to fit data that follows the Michaelis-Menton hyperbolic function. This function can be used for any hyperbolic function. The y-intercept is zero.
1stOrdDecay: Kinetics equation for a first-order reaction in which a reactant disappears. Standard equation for radioactive decay. Ao is the initial amount at t = zero.
2ndOrdDecay: Kinetics equation for a second-order reaction in which a reactant disappears. Ao is the initial amount at t = zero.
Gaussian: The Gaussian or normal distribution function, is a continuous proability distribution. Sometimes known as a Bell curve. The a parameter is the height of the curve, b is the position of the center of the peak and c controls the width of the "bell". The full width at half maximum (FWHM) is 2.35482 * c.
