type TRegressFun = function(const B: TVec; X: double): double;
Defines regression function.
The type describes the regression function of several regression parameters (B array) and independent variable X. The TRegressFun is used in several regression procedure. For higher (vectorized) performance see TMultiRegressFun.
Examples
delphi
// y=b0*x*x + b1*x + b2
function SimpleParabola(const B: TVec; X: double): double;
begin
SimpleParabola := b[0]*Sqr(x) + b[1]*x + b[2];
end;delphi
function Eckerle4(const B: TVec; X: double): double;
begin
Eckerle4 := B[0]/B[1] * Exp(-0.5*Sqr((X-B[2])/B[1]));
end;