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NEWS.md

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Development

  • add type = "ability" to predict.BTm() to allow prediction of abilities in more complex models.
  • make BTm objects compatible with broom::augment().
  • anova.BTm now respects test and dispersion arguments for models that inherit from glm.
  • fix bug in anova.BTmlist affecting models where ability is modelled by predictors but ability is estimated separately for some players due to missing values.
  • fix bug in glmmPQL affecting models with . in formula and either offset or weights specified.

Changes in BradleyTerry2 1.0-9

  • fix bug in setting contrasts in internal function Diff() that gave warning under R-devel.
  • update urls (using https where possible).
  • fix a couple of if statements where argument could be > 1.

Changes in BradleyTerry2 1.0-8

  • fix bug in qvcalc.BTabilities

Changes in BradleyTerry2 1.0-7

Improvements

  • new examples of prediction added, including using predict.BTm to estimate abilities with non-player abilities set to non-zero values (for models with a fixed reference category).
  • qvcalc.BTabilities moved over from package qvcalc.
  • package imports rather than depends on lme4.

Changes in behaviour

  • default level in predict.BTm and predict.glmmPQL is 0 if a fixed effects model has been fitted, 1 otherwise.

Bug fixes

  • BTabilities now works (again) for models where the reference category is not the first player. Players are kept in their original order (levels of player1 and player2), but the abilities are returned with the appropriate reference.

  • BTabilities now works when ability is modelled by covariates and some parameters are inestimable (e.g. as in chameleons.model on ?chameleons).

  • predict.BTglmmPQL now works for models with inestimable parameters

Changes in BradleyTerry2 1.0-6

Changes in behaviour

  • BTabilities now returns NA for unidentified abilities

Bug fixes

  • BTabilities now respects contrasts argument and contrasts attributes of player1 and player2 factors. Also handle unidentified coefficients correctly.

Changes in BradleyTerry2 1.0-5

Bug fixes

  • no longer imports from gnm, so gnm need not be installed.

Changes in BradleyTerry2 1.0-4

Bug fixes

  • depends on lme4 (>=1.0).

Changes in BradleyTerry2 1.0-3

New Features

  • updated football data to include full 2011-12 season.

Changes in BradleyTerry2 1.0-2

New Features

  • added football example presented at useR! 2013 with generalised Davidson model for ties.

Changes in BradleyTerry2 1.0-1

Bug fixes

  • renamed glmmPQL object BTglmmPQL to avoid conflict with lme4 (which loads MASS).
  • fixed BTm so that it is able to find variables when called inside another function (stackoverflow.com question 14911525).

Changes in BradleyTerry2 1.0-0

  • updated references and CITATION to cite JSS paper on BradleyTerry2

Changes in BradleyTerry2 0.9-7

Bug fixes

  • fixed anova.BTmlist to work for models with random effects

  • allow models to be specified with no fixed effects

Improvements

  • updated vignette, including example of bias-reduction, a new example incorporating random effects and a new example on preparing data for use with package

Changes in BradleyTerry2 0.9-6

Bug fixes

  • fixed offset argument to work as documented

  • corrected documentation for citations data

Improvements

  • updated vignette, to provide more explanation of setting up the data

Changes in BradleyTerry2 0.9-5

  • updated contact details

Changes in BradleyTerry2 0.9-4

New Features

  • added ice hockey example presented at useR! 2010

Bug fixes

  • predict.BTm now works for models with no random effects and handles new individuals with missing values in predictors.

Changes in BradleyTerry2 0.9-3

New Features

  • added predict method for BTm objects.

Bug fixes

  • fixed bug in BTm.setup causing problems in finding variables when BTm nested within another function.