Hi all, I am attempting to apply a nonlinear model developed using nls to a new dataset and assess the fit of that model. At the moment, I am using the fitted model from my fit dataset as the starting point for an nls fit for my test dataset (see below). I would like to be able to view the t-statistic and p-values for each of the iterations using the trace function, but have not yet worked out how to do this. Any other suggestions are also welcome.
Many thanks, Rebecca > model.wa <- nls(y ~ A*(x^B), start=list(A=107614,B=-0.415)) # create nls() > power model for WA data > summary(model.wa) # model summary Formula: y ~ A * (x^B) Parameters: Estimate Std. Error t value Pr(>|t|) A 7.644e+04 1.240e+04 6.165 4.08e-06 *** B -3.111e-01 4.618e-02 -6.736 1.15e-06 *** --- Signif. codes: 0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1 Residual standard error: 5605 on 21 degrees of freedom Number of iterations to convergence: 6 Achieved convergence tolerance: 7.184e-06 (6 observations deleted due to missingness) > model.vic <- nls(y.vic ~ A*(x.vic^B), start = list(A = 7.644e+04, B = > -3.111e-01), trace = T) 3430193778 : 76440.0000 -0.3111 2634092902 : 48251.9235397 -0.2552481 2614516166 : 27912.1921354 -0.1772322 2521588892 : 32718.3764594 -0.1862611 2521233646 : 32476.4536126 -0.1836836 2521230904 : 32553.0767231 -0.1841362 2521230824 : 32540.063480 -0.184059 2521230822 : 32542.2970040 -0.1840721 Important Notice: The contents of this email are intended solely for the named addressee and are confidential; any unauthorised use, reproduction or storage of the contents is expressly prohibited. If you have received this email in error, please delete it and any attachments immediately and advise the sender by return email or telephone. Deakin University does not warrant that this email and any attachments are error or virus free. [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.