y.v Posted February 13, 2009 Report Share Posted February 13, 2009 When I add a trendline to my graph, Excel gives me a R^2 value for the generalted equation and Graphmatica gives me a Chi^2 value. What is the difference between the two? Reply Link to post Share on other sites More sharing options...
Abu Posted February 13, 2009 Report Share Posted February 13, 2009 Chi squared is a goodness of fit test, but the chi squared value alone is not good enough for you to judge how well the data fits, you will need to refer to the Chi squared tables for you to see how well it fits:P More and better explained here: [url="http://en.wikipedia.org/wiki/Goodness_of_fit"]http://en.wikipedia.org/wiki/Goodness_of_fit[/url] The R[sup]2[/sup] value is something totally different, which is explained better in the wiki than I can ever explain it: [url="http://en.wikipedia.org/wiki/Goodness_of_fit"]http://en.wikipedia.org/wiki/Goodness_of_fit[/url] Reply Link to post Share on other sites More sharing options...
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