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Special Volume on Spectroscopy and Chemometrics in R Guest Edited by Katharine M. Mullen and Ivo H.M. van Stokkum 11 contributions, with software packages and examples Similar volumes on R in Psychometrics (guest edited by Jan de Leeuw) and R in Political Methodology (guest edited by Micah Altman and Simon Jackman) are close to being finished. Additional volumes are being worked on. Proposals for volumes are...

At www.jstatsoft.org we now have three special volumes Volume 22, Ecology and Ecological Modelling in R (Thomas Kneib and Thomas Petzoldt, eds.) Volume 20, Psychometrics in R (Jan de Leeuw and Patrick Mair, eds.) Volume 18, Spectroscopy and Chemometrics in R (Kate Mullen and Ivo van Stokkum, eds.) Coming soon -- Econometrics in R -- Political Methodology in R Gleam in my eye -- Geosciences / Geostatistics in R Additional suggestions/proposals always welcome. === Jan de Leeuw; Distinguished Professor and Chair, UCLA Department of Statistics; Director: UCLA Center for Environme...

Dear All, I am trying to find MLE by using "OPTIM" function. Difficult in differentiating some parameter in my objective function, I would like to use the returned hessian matrix to yield an estimate of Fisher's Information matrix. My question: Since the hessian is calculated by numerical differentiate, is it a reliable estimate? Otherwise I would have to do a lot of work to

...e/TIMP) we implemented this special-purpose function as "Conv1" in C to be called via .C. It would be nice, at least for us, to have this function (or an improved version) as an option in "convolve". There is more on this in Section 4.2 of Laptenok S, Mullen KM, Borst JW, van Stokkum IHM, Apanasovich VV, Visser AJWG (2007). ``Fluorescence Lifetime Imaging Microscopy (FLIM) Data Analysis with TIMP.'' Journal of Statistical Software, 18(4). URL http://www.jstatsoft.org/v18/i08/. > ------------------------------ > > Message: 8 > Date: Sun, 4 Feb 2007 17:5...