All Forums  Origin Forum for Programming  Forum for Origin C  t-test for significance of regression coefficients

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Screensize: 640 x 480 800 x 600 1024 x 768 1280 x 1024 UserName: Password: Anti-Spam Code: Format Mode: Basic  Help  Prompt  Format: Font Andale Mono Arial Arial Black Book Antiqua Century Gothic Comic Sans MS Courier New Georgia Impact Lucida Console Script MT Bold Stencil Tahoma Times New Roman Trebuchet MS Verdana   Size 1 2 3 4 5 6   Color Black Red Yellow Pink Green Orange Purple Blue Beige Brown Teal Navy Maroon LimeGreen Message: * HTML is OFF * Forum Code is ON Smilies [quote][i]Originally posted by hauli[/i] [br]Origin Version (Select Help-->About Origin): 7.5 Operating System: Windows XP Dear all, I am analyzing results from a toxicological test (AMES test). Empirically I know that the resulting dose-resonse curve starts linearly, then flattens and finally shows a downward trend. I am only interested in the starting linear region, therefore I follow the following procedure to decide on which points ly on the linear part: I fit a polynom of 2nd order to the data, and check with a t-test, if the regression coefficient of the quadratic term is significantly different from zero. If so, I omit the data at the highest dose and start the polynomial fit again. This procedure is done untill the coefficient of the quadratic term is not statistically different from zero. Using Origins tool polynomial fit, I can choose "advanced results" and the regression coefficients are tested with a t-test for significance and the regression ANOVA is displayed. My question now is, how can I perform the t-test for B2 in y= A + B1*x + B2*x^2 programatically with Origin C? Very best regards, Hauli [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.