On Mon, Jan 7, 2013 at 4:29 PM, Martin <lh...@gmx.net> wrote: > Dear all. > > First of all, my english isn't verry good, but I hope I can convey my concern. > I've a general question about the Amelia algorithm. I'm no mathematician or > statistician, but I had to use R and impute and analyse some data, and Amelia > showed results that fitted my expectations. I'll have to defend my choice > soon, > but I haven't totally grasped what Amelia does. I'm particularly interested > in a > simple as possible explanation in how Amelia imputation works. I've read that > it > uses a bootstrapping-based algorithm, but how does it chose the values? > The data had mainly value >0 (chemical concentrations, water temperature and > pH-value). > > Regards Martin
I'm pretty new here, but a quick google search suggests that perhaps http://gking.harvard.edu/amelia (and maybe google translate) might have some decent pointers for you. I poked at the documentation from that site (a pdf file), and it's quite intense on the mathematics, you may get more from it than I could. there's also a link there to a separate, for thisspecific package/algorithm (it seems to be called Amel ia II, I'm assuming this is the same that you used, if I'm off .. sorry about that) HTH -- Even the Magic 8 ball has an opinion on email clients: Outlook not so good. ______________________________________________ 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.
