MagicPlot Manual

Plotting and nonlinear fitting software

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relnotes:notes27 [Thu Jun 30 15:08:03 2016]
Alexander
relnotes:notes27 [Wed Aug 1 20:46:45 2018] (current)
Alexander
Line 95: Line 95:
 ====== Various Improvements and Fixes ====== ====== Various Improvements and Fixes ======
  
-Many little enhancements and bug fixes were made based on the user feedback and testing. The full list can be found in [[:release_notes|release notes]].+Many enhancements and bug fixes were made based on the user feedback and testing. The full list can be found in [[:release_notes|release notes]]. 
 + 
 +===== A Correction in Chi Square Calculation if Y Errors are Set ===== 
 + 
 +In nonlinear fitting algorithm in MagicPlot 2.5.1 and older, if Y error column(s) were set, weights of points were normalized so that the sum of weights was equal to one. The resulting chi square value shown in the 'fit report' tab in old releases did not take into account the real Y error amplitudes. In MagicPlot 2.7 the point weights are not normalized and the chi square is calculated correctly. Note that this modification does not affect the resulting fit parameter values and standard deviations which were calculated correctly in all releases. See also: [[:fit_formulas]].
  
 [[http://magicplot.com/downloads.php|Download MagicPlot]] [[http://magicplot.com/downloads.php|Download MagicPlot]]
  
relnotes/notes27.1467288483.txt.gz · Last modified: Thu Jun 30 15:08:34 2016 (external edit)