Forum: DirichletReg 0.4-0 on R-Forge
Posted by: Marco J. Maier
Content: a new version is out and there have been quite a lot of changes. some new features are:- the data structure of objects generated by DR_data() has been changed. it is no longer a list, but now a numeric matrix of class "DirichletRegData" with lots of attributes. this permits you to store the processed data in the original data.frame to keep your workspace tidy, e.g., > ArcticLake$Y <- DR_data(ArcticLake[, 1:3]) so you can fit a model like: > DirichReg(Y ~ depth, ArcticLake) note that `free floating' dependent variables (i.e., not part of the data.frame) can also be used, as in prior versions. - formula processing is now handled by the package `Formula' which is much more robust than my `homemade' routines in earlier versions and has the advantage that - there is an update() method for Dirichlet regression models. so if you fit a model like > res1 <- DirichReg(Y ~ depth + I(depth^2), ArcticLake) you can easily omit, e.g., the quadratic term for `sand' by typing > res2 <- update(res1, . ~ . -I(depth^2)) instead of having to specify a completely new model like > DirichReg(Y ~ depth | depth + I(depth^2) | depth + I(depth^2), ArcticLake) therefore, model selection is made a lot easier. - i did my best to complete the documentation which was a little fragmentary for some topics. - optimization settings have been tweaked and estimation is now both, faster, and more robust. - the package is now, by default, byte-compiled and therefore even faster. - some new methods for the class "DirichletRegModel" have been implemented. - DirichReg() has a couple of useful new features (subset, weights, etc.). - lots more ... please consult the documentation and have a look at the examples. |
Latest NewsDirichletReg 0.6-1 on R-Forge and CRANMarco J. Maier - 2014-12-12 11:25 -
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