Analysis of Overdispersed Data

Provides a set of functions to analyse overdispersed counts or proportions. Most of the methods are already available elsewhere but are scattered in different packages. The proposed functions should be considered as complements to more sophisticated methods such as generalized estimating equations (GEE) or generalized linear mixed effect models (GLMM).


News

  ====================================================
  CHANGES IN aod VERSION 1.3 (released on 10 Apr 2012)
  ====================================================

Changes

o Changes in the code for iccbin to reflect changes in package lme4.

o Function .First.lib (defunct) was removed.

o File DESCRIPTION was changed.

o File NAMESPACE was added (default setting).

==================================================== CHANGES IN aod VERSION 1.2 (released on 08 Oct 2010) ====================================================

Changes

o Function icc was removed and replaced with function iccbin, with
  several computations methods for the intra-class correlation 
  coefficient in the case of binomial data.

o Help pages were changed accordingly.

  ========================================================
  CHANGES IN aod VERSION 1.1-35 (released on 04 Oct 2010)
  ========================================================

Changes

o Corrects code in betabin and quasibin to avoid a note in package
  building.

  ========================================================
  CHANGES IN aod VERSION 1.1-34 (released on 03 Oct 2010)
  ========================================================

Changes

o Corrects a bug in the shwo method for objects of class icc
  (error in the computation of the F test).

o Improved description of the icc function (help page).


  ==========================================================
  CHANGES IN aod VERSION 1.1-33 (released on 13 April 2010)
  ==========================================================

Changes

o Synchronise version of splitbin and its help page with version available
  in package tdisplay http://forums.cirad.fr/logiciel-R/viewforum.php?f=5.

o Internal changes in function icc to reflect changes in splitbin.


  ==========================================================
  CHANGES IN aod VERSION 1.1-32 (released on 2nd April 2010)
  ==========================================================

Bug

o Corrected a bug in the print method for Wald test objects.

New feature

o df.residual method for objects of class glimQL, and corresponding
changes in the documentation.


  ============================================================
  CHANGES IN aod VERSION 1.1-29 (released on 10th October 2008)
  ============================================================

Bug

o Corrected a bug in the predict method for objects of classe glimML and
glimQL, and its documentation.


  ============================================================
  CHANGES IN aod VERSION 1.1-27 (released on 25th August 2008)
  ============================================================

New

o CITATION file.

Changes

o Alter the functions to compute AIC and AICc to avoid redefining standard
  generic functions from the stats package, after a bug report on R-Help and
  suggestions by P Dalgaard and M Maechler.

o Alter functions betabin and negbin to better manage the case when the Hessian
  matrix is singular.

o Many invisible changes in documentation to comply with more stringent checks
  during package installation and building.

  ==============================================================
  CHANGES IN aod VERSION 1.1-24 (released on 30th September 2007)
  ==============================================================

Changes

o Maintenance change in the file dja.Rd to comply with new recommandations
  as from 2.6.0.


   ==============================================================
  CHANGES IN aod VERSION 1.1-23 (released on 29th September 2007)
  ==============================================================

Changes

o Maintenance change in the file DESCRIPTION to comply with new recommandations
  as from 2.6.0.


  =========================================================
  CHANGES IN aod VERSION 1.1-22 (released on 23rd May 2007)
  =========================================================

New

o The cloglog link was missing for quasibin models (though it was
  indicated in the documentation).


  =========================================================
  CHANGES IN aod VERSION 1.1-21 (released on 7th April 2007)
  =========================================================

DOCUMENTATION

o Mismatches were fixed between arguments in the code and documentation
  (predict methods for objects of classes glimML and glimPQL).


  =========================================================
  CHANGES IN aod VERSION 1.1-20 (released on 4th April 2007)
  =========================================================

DOCUMENTATION

o Mismatches were fixed between arguments in the code and documentation
  (residuals methods for objects of classes glimML and glimPQL).


  ==========================================================
  CHANGES IN aod VERSION 1.1-19 (released on 1st April 2007)
  ==========================================================

NEW FEATURES

o	In negbin and betabin, the (default) maximum number of iterations was set
  to 2000 in the call to optim. A new argument "control" was introduces in
  the 2 functions and their help pages were amended.

BUGS

o	A bug was corrected in the residuals method for S4 objects of class glimML
 (incorrect use of the extractor function "$" instead of "@").


  =============================================================
  CHANGES IN aod VERSION 1.1-18 (released on 13th January 2007)
  =============================================================

NEW FEATURES

o	In negbin and betabin, display was switched to 4 digits in scientific notation.

BUGS

o	No warning was issued when convergence was not obtained after optim iterations.
A slot "msg" was added to fitted objects of class "glimML" to store the message
returned by optim.

o	An error occurred when model was fitted with hessian = FALSE.

DOCUMENTATION

o Documentation was changed to reflect these modifications. Some messages released
by negbin and betabin were corrected.


  ============================================================
  CHANGES IN aod VERSION 1.1-14 (released on 9th January 2007)
  ============================================================

BUGS

o	A bug occurred when the hessian matrix was singular (overpameterized model)
in models fitted with betabin or negbin. This was fixed. A new slot "singular.hessian"
was added to fitted objects of class "glimML".

o	There was a bug in the coef method for objects of class glimML when at least
one of the explanatory variable was a factor had unused levels. To overcome
this problem, new slots "fixed.param" and "random.param" were added to fitted
objects of class "glimML".

DOCUMENTATION

o Documentation was changed to reflect these modifications.


  ============================================================
  CHANGES IN aod VERSION 1.1-13 (released on 15th October 2006)
  ============================================================

DOCUMENTATION

o	The help page for the package (?aod) was out of date.


  ===========================================================
  CHANGES IN aod VERSION 1.1-12 (released on 7th October 2006)
  ===========================================================

INSTALLATION

o	The package "boot" is now suggested to remove a warning during package installation.

  ========================================================
  CHANGES IN aod VERSION 1.1-11 (released on 1st July 2006)
  ========================================================

NEW FEATURES

o	The display of wald.test()'s output was slightly changed.


  =======================================================
  CHANGES IN aod VERSION 1.1-10 (released on 5th May 2006)
  =======================================================

BUGS

o	The code of the log-likelihood function was changed in betabin and negbin to avoid
    warnings when a covariate was used to model the within-group correlation, and one of the
    "random" coeffcient was set to 0 (warnings were related to the use of ifelse).
    These warnings caused a very slow execution with R 2.3.0, probably because of some
    changes in the functions handling warnings and errors (tryCatch, etc.).


  =======================================================
  CHANGES IN aod VERSION 1.1-9 (released on 1st May 2006)
  =======================================================

NEW FEATURES

o	In function splitbin(), any variable of mode character is now transformed into a factor
    before data processing.

DOCUMENTATION

o	New help page describing the package.


  ========================================================
  CHANGES IN aod VERSION 1.1-8 (released on 20th July 2005)
  ========================================================

NEW FEATURES

o	The number of observations was added as an attribute of the number
	returned by "logLik".

o	The corrected AIC (AICc) was added to the output of the function "AIC" and
	included in the comparison statistics of the anova method for objects of
	formal class "glimML".

o	A new formal class "aic" was created, with a summary method to compute
	Akaike difference and Akaike weights from a list of models to be compared.

o	A control was added in "betabin" and "negbin" to check the presence of
	lines with null weight (thanks to J�r�my Bouyer).

o	The show method for objects of formal class "glimML" was slightly altered:
	AICc was added to the output and a new presentation was adopted for log-
	likelihood and related statistics.

DOCUMENTATION

o	The documentation of functions "AIC", "anova" and "logLik" was revised to
	reflect the changes in these functions.


  =======================================================
  CHANGES IN aod VERSION 1.1-4 (released on 9th July 2005)
  =======================================================

BUGS

o	The name of the first model was always "object" in the anova method for
	objects of formal class glimML.

NEW FEATURES

o	The slot "digits" was removed for objects of formal class anova.glimML.


  =======================================================
  CHANGES IN aod VERSION 1.1-3 (released on 1st July 2005)
  =======================================================

DOCUMENTATION

o	Minor revisions of help pages: spelling in different places and reference
	change for fonction negbin.


  =======================================================
  CHANGES IN aod VERSION 1.1-2 (released on 8th June 2005)
  =======================================================

DOCUMENTATION

o	Minor revisions of help pages.

BUGS

o A wrong title line was removed in the display of models of class "glimML".


  =======================================================
  CHANGES IN aod VERSION 1.1-1 (released on 7th June 2005)
  =======================================================

NEW FEATURES

o Revision of code and help in the S4 framework.

o Add packages "methods" and "stats" in the "Depends" field of the file
	DESCRIPTION (thanks to Kurt Hornik).

o "logLik" and "AIC" methods for objects of formal class "glimML".

o New "summary" method for objects of class "glimML".

o New formal class "summary.glimML" to represent the summary of objects of
	formal class "glimML".

BUGS

o Fixed a lot of missing links and undocumented classes and objects, thanks
	to Kurt Hornik.


  =======================================================
  CHANGES IN aod VERSION 1.0-2 (released on 5th June 2005)
  =======================================================

NEW FEATURES

o S4 generic functions are now explicitely defined.

BUGS

o In anova.glimML(), arguments digits now works.

DOCUMENTATION

o	Help pages for classes icc and varbin.


  =======================================================
  CHANGES IN aod VERSION 1.0-1 (released on 4th June 2005)
  =======================================================

DOCUMENTATION

o	Minor changes in documentation.

Reference manual

It appears you don't have a PDF plugin for this browser. You can click here to download the reference manual.

install.packages("aod")

1.3.1 by Renaud Lancelot, 7 months ago


https://cran.r-project.org/package=aod


Browse source code at https://github.com/cran/aod


Authors: Matthieu Lesnoff <[email protected]> and Renaud Lancelot <[email protected]>


Documentation:   PDF Manual  


Task views: Econometrics, Analysis of Ecological and Environmental Data, Statistics for the Social Sciences


GPL (>= 2) license


Depends on methods, stats

Suggests MASS, boot, lme4


Imported by AutoModel, DTR, ExomeDepth, LogisticDx, StroupGLMM, feisr, mmeta, reportRx, riskclustr, xmeta.

Depended on by MOJOV.

Suggested by RcmdrPlugin.EZR, ggeffects, glmulti, insight, shrink.

Enhanced by MuMIn, prediction.


See at CRAN