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distline.txt
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2004-07-02
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POLI_N.DLL
Plugin for FindGraph.exe (www.uniphiz.com/findgraph.htm)
*
**************************************************************
How to use:
Place DISTLINE.DLL in the program FindGraph subfolder "Appr".
Start FundGraph.
Start The Wizard of approximation.
On step 2 select 'User defined function'.
If all right, on step 3 your function will appear in list.
Approximation function:
V(U) = A0 + A1*U + ... +An*U^N
Find the line that minimizes the perpendicular distance
between line and points.
This is so called 'Deming regression'. It fits a polynomial
line assuming equal experimental errors in both U and V.
In contrast, ordinary regression assumes that the U values
are known precisely and all the experimental error is in V.
Important, U and V must be in the same units.
Parameters:
If 1, fixed point (U0, V0) on resulting line.
N = pow of polynomial approximation in limits from 0 to +4
Example:
N=1, U0=0, V0=0
V(U) = A0 + A1*U
Questions:
Sergey Vasilyev
serg@uniphiz.com