[R-lang] Re: Fwd: [R] [R-pkgs] New package: ordinal
Fri Apr 9 11:46:13 PDT 2010
This package is indeed useful, but be aware that you're limited in one
Quoting Roger Levy <firstname.lastname@example.org>:
> This package looks like it could be of interest to many R-lang members...
> Begin forwarded message:
>> From: Rune Haubo <email@example.com>
>> Date: March 16, 2010 3:45:14 AM PDT
>> To: firstname.lastname@example.org
>> Subject: [R] [R-pkgs] New package: ordinal
>> This is to announce the new R-package ‘ordinal’ that implements
>> cumulative link (mixed) models for ordinal (ordered categorical) data
>> The main features are:
>> - scale (multiplicative) as well as location (additive) effects
>> - nominal effects for a subset of the predictors (denoted partial
>> proportional odds when the link is the logistic)
>> - structured thresholds, e.g. assuming symmetry or equidistant thresholds
>> - random effects via the Laplace approximation and adaptive
>> Gauss-Hermite quadrature in the location-part of the model.
>> - a range of standard link functions
>> - flexible link functions where an extra link function-parameter
>> bridges the log-log, probit and c-loglog links (log-gamma), and
>> cloglog and logistic links (Aranda-Ordaz)
>> - a suite of optimizers including an efficient Newton scheme.
>> - works for binomial observations (a special case of ordinal data).
>> - a suite of methods including anova, addterm, dropterm, profile,
>> confint, plot.profile, predict, in addition to the standard print and
>> summary methods.
>> - an important special case is the proportional odds model (with
>> random effects).
>> - a range of examples illustrates how to use the functions.
>> Future additions will include:
>> - more general random effect structures: multiple (crossed and nested)
>> and vector-valued random effects.
>> - profile methods for variance parameters in mixed effect models.
>> - helpful package vignettes.
>> - implementation of core functions in C.
>> Comments, critique, suggestions, wishes and contributions are always
>> highly appreciated.
>> Kind regards
>> Rune Haubo Bojesen Christensen
>> PhD student, M.Sc. Eng.
>> Phone: (+45) 45 25 33 63
>> Mail: rhbc at imm.dtu.dk
>> DTU Informatics, Section for Statistics
>> Technical University of Denmark, Build. 305, Room 122,
>> DK-2800 Kgs. Lyngby, Denmark
>> R-packages mailing list
>> Remail@example.com mailing list
>> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
> Roger Levy Email: firstname.lastname@example.org
> Assistant Professor Phone: 858-534-7219
> Department of Linguistics Fax: 858-534-4789
> UC San Diego Web: http://ling.ucsd.edu/~rlevy
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