Hi, I want to find a functional form for my data. I have tried smoothing and obtained a kinda perfect fit. However, I can only draw it but cannot call it. I am wondering that is there a way that I can store the fit as a function and apply it when needed. e.g. tranformation etc. Many thanks! Yours sincerely, Xiaoyu [[alternative HTML version deleted]]
> I want to find a functional form for my data. I have tried > smoothing and obtained a kinda perfect fit. > However, I can only draw it but cannot call it.You'll need to apply the smoothing function to the data separately, store that and plot the curve (?) fom that. You can plot a line for many model fits using the associated predict() method and if necessary specifying a newdata data frame containing neatly-spaced predictors; look up the generic ?predict and predict.lm for a typical case. predict.nlm and predict.loess also exist and work much the same way. S Ellison ******************************************************************* This email and any attachments are confidential. Any use...{{dropped:8}}
Your question is very vague, so it's hard to know what to suggest. Please note the exhortation that appears at the bottom of every r-help message:> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code.It is possible that splinefun() is what you are looking for. cheers, Rolf Turner On 10/07/13 22:29, Xiaoyu Lu wrote:> Hi, > > I want to find a functional form for my data. I have tried smoothing and > obtained a kinda perfect fit. > However, I can only draw it but cannot call it. > > I am wondering that is there a way that I can store the fit as a function > and apply it when needed. e.g. tranformation etc.