[R] Maximum likelihood acf
Hello! I am looking for a function which computes the maximum likelihood estimator of the autocorrelation function for a gaussian time series. Does a such function already exist in R? The estimator by default in R, acf(), uses the method of moments. Thanks a lot, Alain -- Alain Guillet Statistician and Computer Scientist Institut de statistique - Université catholique de Louvain Bureau d.126 Voie du Roman Pays, 20 B-1348 Louvain-la-Neuve Belgium tel: +32 10 47 30 50 __ R-help@stat.math.ethz.ch 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.
Re: [R] Maximum likelihood acf
Prof. Brian Ripley, You are right, my question was not clear. In fact, I want to estimate the k first components of the acf, i.e. I want to estimate the k parameters (c(0),c(1),...c(k-1)), where c is the autocorrelation function, by a maximum likelihood estimator. Alain Prof Brian Ripley a écrit : You will need to give us a reference, as the acf is not a parameter in a model in your description and MLEs apply to model parameters. Just possibly ar.mle is what you are looking for, perhaps plus ARMAacf? On Fri, 12 Jan 2007, Alain Guillet wrote: Hello! I am looking for a function which computes the maximum likelihood estimator of the autocorrelation function for a gaussian time series. Does a such function already exist in R? The estimator by default in R, acf(), uses the method of moments. Thanks a lot, Alain -- Alain Guillet Statistician and Computer Scientist Institut de statistique - Université catholique de Louvain Bureau d.126 Voie du Roman Pays, 20 B-1348 Louvain-la-Neuve Belgium tel: +32 10 47 30 50 __ R-help@stat.math.ethz.ch 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.
Re: [R] Maximum likelihood acf
In fact, I need it in the general case, not only for an ARMA process. Unfortunately, I have no reference to give so I will code it. Sorry for the trouble. Alain Prof Brian Ripley a écrit : On Fri, 12 Jan 2007, Alain Guillet wrote: Prof. Brian Ripley, You are right, my question was not clear. In fact, I want to estimate the k first components of the acf, i.e. I want to estimate the k parameters (c(0),c(1),...c(k-1)), where c is the autocorrelation function, by a maximum likelihood estimator. And does ARMAacf applied to the result of ar.mle not do just that? An accessible reference would help us, if not. Alain Prof Brian Ripley a écrit : You will need to give us a reference, as the acf is not a parameter in a model in your description and MLEs apply to model parameters. Just possibly ar.mle is what you are looking for, perhaps plus ARMAacf? On Fri, 12 Jan 2007, Alain Guillet wrote: Hello! I am looking for a function which computes the maximum likelihood estimator of the autocorrelation function for a gaussian time series. Does a such function already exist in R? The estimator by default in R, acf(), uses the method of moments. Thanks a lot, Alain -- Alain Guillet Statistician and Computer Scientist Institut de statistique - Université catholique de Louvain Bureau d.126 Voie du Roman Pays, 20 B-1348 Louvain-la-Neuve Belgium tel: +32 10 47 30 50 __ R-help@stat.math.ethz.ch 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.
Re: [R] Mayday ! Needing urgent help about writing results to a file
Marc, This is an exercise of the lesson STAT2430 at the UCL. Please, do your homework alone Marc Feuerstein a écrit : Hey listmembers, I am desperately trying to write a data frame to a file. Not in CSV, but as they appear on the screen (nice, easy to read tables). I've read that the sink function is the way to go. I have tried the following code inside a function. sink(ABC.txt) MyFrameA MyFrameB sink() It gives the result I need when I use it outside a function, but when I use it *inside* a function I wrote, it creates an empty file. I want to pull my hair out ! What should I do so that, when the function ends, I have a text file called ABC.txt having MyFrameA and MyFrameB in the same file. Thanks so much (in advance) to help me out on this one ! I'm sure some of you already encountered such a situation. Marc. [[alternative HTML version deleted]] __ R-help@stat.math.ethz.ch 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. -- Alain Guillet Statistician and Computer Scientist Institut de statistique - Université catholique de Louvain Bureau d.126 Voie du Roman Pays, 20 B-1348 Louvain-la-Neuve Belgium tel: +32 10 47 30 50 __ R-help@stat.math.ethz.ch 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.
