Brigid Mooney <bkmooney <at> gmail.com> writes: > I am doing some basic regression analysis, and am getting a bit > confused on how to enter non-polynomial formulas to be used. .. > But am confused on what the formula should be for trying to find a fit > to y = A*exp(r*x).
If this example is just a placeholder for "more complex than poly", you should check function nls which works for non-linear functions. However, if you really want to solve this problem only, doing a log on you data and fitting a log of the above function with lm() is the easiest way out. Results can be a bit different from the nonlinear case depending on noise, because in one case weight are log-weighted, in the other linearly. Dieter ______________________________________________ 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.
