[Gnuplot-info] which fit approximation is better?

[developer_student <jua...@gm...>]

Imagine I want to fit a set of points to a math function. And I know points
are well approximated by a*x^2 + b*x + c and also a*ln(x)*x + b*x + c . So I
type them in gnuplot:

stApprox(x) = a*x**2 + b*x + c
fit stApprox(x) 'mydata.dat' via a,b,c

ndApprox(x) = d*log(x)*x + e*x + f
fit ndApprox(x) 'mydata.dat' via d,e,f

Then now I want to know which of them (stApprox or ndApprox) approximates
better the curve of my data. 

How can I get it? Anyone can help me, please?

Thank you in advance.
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