CorelPolyGUI-0.2.1

CorelPolyGUI
by:

• Marcin Gutman
  mgutman(at)op(dot)pl
• Laurent Balland-Poirier
  jumbo4444(at)yahoo(dot)fr
• Laurent Godard
  oooconv(at)free(dot)fr

Fit a polynomial regression curve to (X,Y) data: (*)

• [a⋅x^i] or [a⋅exp(x⋅i)] model
• negative degrees possible
• force intercept option [Y(0) = a0]
• give polynomial equation and determination coefficient
• plot experimental points and calculated curve
• can be used for linear regression with force intercept option (**)

(*) Based on CorelPoly.sxc by Laurent Godard
http://oooconv.free.fr/fitoo/fitoo_en.html

(*) Issue 20819
http://qa.openoffice.org/issues/show_bug.cgi?id=20819

(**) Issue 34093
http://qa.openoffice.org/issues/show_bug.cgi?id=34093

Known problems

• For 3rd degree polynominal and data:
  X, Y
  2000, 2577
  2002, 2870
  2004, 3197
  2006, 3049
  2008, 3422
  2010, 4007

  results are inaccurate.
  This is probably due to bad conditioned matrix passed to OOo's MINVERSE function .