# performance 0.7.1

## New supported models

* Add support for `model_fit` (*tidymodels*).

* `model_performance` supports *kmeans* models.

## General

* Give more informative warning when `r2_bayes()` for *BFBayesFactor* objects
  can't be calculated.

* Several `check_*()` functions now return informative messages for invalid
  model types as input.

* `r2()` supports `mhurdle` (*mhurdle*) models.

* Added `print()` methods for more classes of `r2()`.

* The `performance_roc()` and `performance_accuracy()` functions unfortunately 
  had spelling mistakes in the output columns: *Sensitivity* was called 
  *Sensivity* and *Specificity* was called *Specifity*. We think these are 
  understandable mistakes :-)

## Changes to functions

### `check_model()`

* `check_model()` gains more arguments, to customize plot appearance.

* Added option to detrend QQ/PP plots in `check_model()`.

### `model_performance()`

* The `metrics` argument from `model_performance()` and `compare_performance()`
  gains a `"AICc"` option, to also compute the 2nd order AIC.

* `"R2_adj"` is now an explicit option in the `metrics` argument from
  `model_performance()` and `compare_performance()`.

### Other functions

* The default-method for `r2()` now tries to compute an r-squared for all models
  that have no specific `r2()`-method yet, by using following formula:
  `1-sum((y-y_hat)^2)/sum((y-y_bar)^2))`
  
* The column name `Parameter` in `check_collinearity()` is now more
  appropriately named `Term`.

## Bug fixes

* `test_likelihoodratio()` now correctly sorts models with identical fixed
  effects part, but different other model parts (like zero-inflation).

* Fixed incorrect computation of models from inverse-Gaussian families, or
  Gaussian families fitted with `glm()`.

* Fixed issue in `performance_roc()` for models where outcome was not 0/1 coded.

* Fixed issue in `performance_accuracy()` for logistic regression models when
  `method = "boot"`.

* `cronbachs_alpha()` did not work for `matrix`-objects, as stated in the docs.
  It now does.

# performance 0.7.0

## General

* Roll-back R dependency to R >= 3.4.

## Breaking Changes

* `compare_performance()` doesn't return the models' Bayes Factors, now returned
  by `test_performance()` and `test_bf()`.

## New functions to test or compare models

* `test_vuong()`, to compare models using Vuong's (1989) Test.

* `test_bf()`, to compare models using Bayes factors.

* `test_likelihoodratio()` as an alias for `performance_lrt()`.

* `test_wald()`, as a rough approximation for the LRT.

* `test_performance()`, to run the most relevant and appropriate tests based on
  the input.

## Changes to functions

### `performance_lrt()`

* `performance_lrt()` get an alias `test_likelihoodratio()`.

* Does not return AIC/BIC now (as they are not related to LRT *per se* and can
  be easily obtained with other functions).

* Now contains a column with the difference in degrees of freedom between
  models.

* Fixed column names for consistency.

### `model_performance()`

* Added more diagnostics to models of class `ivreg`.

### Other functions

* Revised computation of `performance_mse()`, to ensure that it's always based
  on response residuals.

* `performance_aic()` is now more robust.

## Bug fixes

* Fixed issue in `icc()` and `variance_decomposition()` for multivariate
  response models, where not all model parts contained random effects.

* Fixed issue in `compare_performance()` with duplicated rows.

* `check_collinearity()` no longer breaks for models with rank deficient model
  matrix, but gives a warning instead.

* Fixed issue in `check_homogeneity()` for `method = "auto"`, which wrongly
  tested the response variable, not the residuals.

* Fixed issue in `check_homogeneity()` for edge cases where predictor had
  non-syntactic names.

# performance 0.6.1

## General

* `check_collinearity()` gains a `verbose` argument, to toggle warnings and
  messages.

## Bug fixes

* Fixed examples, now using suggested packages only conditionally.

# performance 0.6.0

## General

* `model_performance()` now supports `margins`, `gamlss`, `stanmvreg` and
  `semLme`.

## New functions

* `r2_somers()`, to compute Somers' Dxy rank-correlation as R2-measure for
  logistic regression models.

* `display()`, to print output from package-functions into different formats.
  `print_md()` is an alias for `display(format = "markdown")`.

## Changes to functions

### `model_performance()`

* `model_performance()` is now more robust and doesn't fail if an index could
  not be computed. Instead, it returns all indices that were possible to
  calculate.

* `model_performance()` gains a default-method that catches all model objects
  not previously supported. If model object is also not supported by the
  default-method, a warning is given.

* `model_performance()` for metafor-models now includes the degrees of freedom
  for Cochran's Q.

### Other functions

* `performance_mse()` and `performance_rmse()` now always try to return the
  (R)MSE on the response scale.

* `performance_accuracy()` now accepts all types of linear or logistic
  regression models, even if these are not of class `lm` or `glm`.

* `performance_roc()` now accepts all types of logistic regression models, even
  if these are not of class `glm`.

* `r2()` for mixed models and `r2_nakagawa()` gain a `tolerance`-argument, to
  set the tolerance level for singularity checks when computing random effect
  variances for the conditional r-squared.

## Bug fixes

* Fixed issue in `icc()` introduced in the last update that make `lme`-models
  fail.

* Fixed issue in `performance_roc()` for models with factors as response.

# performance 0.5.1

## Breaking changes

* Column names for `model_performance()` and `compare_performance()` were
  changed to be in line with the _easystats_ naming convention: `LOGLOSS` is now
  `Log_loss`, `SCORE_LOG` is `Score_log` and `SCORE_SPHERICAL` is now
  `Score_spherical`.

## New functions
* `r2_posterior()` for Bayesian models to obtain posterior distributions of
  R-squared.

## Changes to functions

* `r2_bayes()` works with Bayesian models from `BayesFactor` ( #143 ).

* `model_performance()` works with Bayesian models from `BayesFactor` ( #150 ).

* `model_performance()` now also includes the residual standard deviation.

* Improved formatting for Bayes factors in `compare_performance()`.

* `compare_performance()` with `rank = TRUE` doesn't use the `BF` values when
  `BIC` are present, to prevent "double-dipping" of the BIC values (#144).

* The `method` argument in `check_homogeneity()` gains a `"levene"` option, to
  use Levene's Test for homogeneity.

## Bug fixes

* Fix bug in `compare_performance()` when `...` arguments were function calls to
  regression objects, instead of direct function calls.

# performance 0.5.0

## General

* `r2()` and `icc()` support `semLME` models (package *smicd*).

* `check_heteroscedasticity()` should now also work with zero-inflated mixed
  models from *glmmTMB* and *GLMMadpative*.

* `check_outliers()` now returns a logical vector. Original numerical vector is
  still accessible via `as.numeric()`.

## New functions

* `pp_check()` to compute posterior predictive checks for frequentist models.

## Bug fixes

* Fixed issue with incorrect labeling of groups from `icc()` when `by_group =
  TRUE`.

* Fixed issue in `check_heteroscedasticity()` for mixed models where sigma could
  not be calculated in a straightforward way.

* Fixed issues in `check_zeroinflation()` for `MASS::glm.nb()`.

* Fixed CRAN check issues.

# performance 0.4.8

## General

* Removed suggested packages that have been removed from CRAN.

## Changes to functions

* `icc()` now also computes a "classical" ICC for `brmsfit` models. The former
  way of calculating an "ICC" for `brmsfit` models is now available as new
  function called `variance_decomposition()`.

## Bug fixes

* Fix issue with new version of *bigutilsr* for `check_outliers()`.

* Fix issue with model order in `performance_lrt()`.

# performance 0.4.7

## General

* Support for models from package *mfx*.

## Changes to functions

* `model_performance.rma()` now includes results from heterogeneity test for
  meta-analysis objects.

* `check_normality()` now also works for mixed models (with the limitation that
  studentized residuals are used).

* `check_normality()` gets an `effects`-argument for mixed models, to check
  random effects for normality.

## Bug fixes

* Fixed issue in `performance_accuracy()` for binomial models when response
  variable had non-numeric factor levels.

* Fixed issues in `performance_roc()`, which printed 1 - AUC instead of AUC.

# performance 0.4.6

## General

* Minor revisions to `model_performance()` to meet changes in *mlogit* package.

* Support for `bayesx` models.

## Changes to functions

* `icc()` gains a `by_group` argument, to compute ICCs per different group
  factors in mixed models with multiple levels or cross-classified design.

* `r2_nakagawa()` gains a `by_group` argument, to compute explained variance at
  different levels (following the variance-reduction approach by Hox 2010).

* `performance_lrt()` now works on *lavaan* objects.

## Bug fixes

* Fix issues in some functions for models with logical dependent variable.

* Fix bug in `check_itemscale()`, which caused multiple computations of skewness
  statistics.

* Fix issues in `r2()` for *gam* models.

# performance 0.4.5

## General

* `model_performance()` and `r2()` now support *rma*-objects from package
  *metafor*, *mlm* and *bife* models.

## Changes to functions

* `compare_performance()` gets a `bayesfactor` argument, to include or exclude
  the Bayes factor for model comparisons in the output.

* Added `r2.aov()`.

## Bug fixes

* Fixed issue in `performance_aic()` for models from package *survey*, which
  returned three different AIC values. Now only the AIC value is returned.

* Fixed issue in `check_collinearity()` for *glmmTMB* models when zero-inflated
  formula only had one predictor.

* Fixed issue in `check_model()` for *lme* models.

* Fixed issue in `check_distribution()` for *brmsfit* models.

* Fixed issue in `check_heteroscedasticity()` for *aov* objects.

* Fixed issues for *lmrob* and *glmrob* objects.

# performance 0.4.4

## General

* Removed `logLik.felm()`, because this method is now implemented in the *lfe*
  package.

* Support for `DirichletRegModel` models.

## New functions

* `check_itemscale()` to describe various measures of internal consistencies for
  scales which were built from several items from a PCA, using
  `parameters::principal_components()`.

* `r2_efron()` to compute Efron's pseudo R2.

## Bug fixes

* Fixed issue in documentation of `performance_score()`.

# performance 0.4.3

## General

* Support for `mixor`, `cpglm` and `cpglmm` models.

## New functions

* `performance_aic()` as a small wrapper that returns the AIC. It is a generic
  function that also works for some models that don't have a AIC method (like
  Tweedie models).

* `performance_lrt()` as a small wrapper around `anova()` to perform a
  Likelihood-Ratio-Test for model comparison.

## Bug fixes

* Fix issues with CRAN checks.

## Changes to functions

* `model_performance()` now calculates AIC for Tweedie models.

# performance 0.4.2

## General

* Support for `bracl`, `brmultinom`, `fixest`, `glmx`, `glmmadmb`, `mclogit`,
  `mmclogit`, `vgam` and `vglm` models.

* `model_performance()` now supports *plm* models.

* `r2()` now supports *complmrob* models.

* `compare_performance()` now gets a `plot()`-method (requires package
  **see**).

## Changes to functions

* `compare_performance()` gets a `rank`-argument, to rank models according to
  their overall model performance.

* `compare_performance()` has a nicer `print()`-method now.

* Verbosity for `compare_performance()` was slightly adjusted.

* `model_performance()`-methods for different objects now also have a
  `verbose`-argument.

## Minor changes

* `check_collinearity()` now no longer returns backticks in row- and column
  names.

## Bug fixes

* Fixed issue in `r2()` for `wbm`-models with cross-level interactions.

* `plot()`-methods for `check_heteroscedasticity()` and `check_homogeneity()`
  now work without requiring to load package *see* before.

* Fixed issues with models of class `rlmerMod`.

# performance 0.4.0

## General

* `performance()` is an alias for `model_performance()`.

## Deprecated and Defunct

* `principal_components()` was removed and re-implemented in the
  **parameters**-package. Please use `parameters::principal_components()` now.

## Changes to functions

* `check_outliers()` now also works on data frames.

* Added more methods to `check_outliers()`.

* `performance_score()` now also works on `stan_lmer()` and `stan_glmer()`
  objects.

* `check_singularity()` now works with models of class *clmm*.

* `r2()` now works with models of class *clmm*, *bigglm* and *biglm*.

* `check_overdispersion()` for mixed models now checks that model family is
  Poisson.

## Bug fixes

* Fixed bug in `compare_performance()` that toggled a warning although models
  were fit from same data.

* Fixed bug in `check_model()` for *glmmTMB* models that occurred when checking
  for outliers.

# performance 0.3.0

## General

* Many `check_*()`-methods now get a `plot()`-method. Package **see** is
  required for plotting.

* `model_performance()` gets a preliminary `print()`-method.

## Breaking changes

* The attribute for the standard error of the Bayesian R2 (`r2_bayes()`) was
  renamed from `std.error` to `SE` to be in line with the naming convention of
  other easystats-packages.

* `compare_performance()` now shows the Bayes factor when all compared models
  are fit from the same data. Previous behaviour was that the BF was shown when
  models were of same class.

## Changes to functions

* `model_performance()` now also works for *lavaan*-objects.

* `check_outliers()` gets a `method`-argument to choose the method for detecting
  outliers. Furthermore, two new methods (Mahalanobis Distance and Invariant
  Coordinate Selection) were implemented.

* `check_model()` now performs more checks for GLM(M)s and other model objects.

* `check_model()` gets a `check`-argument to plot selected checks only.

* `r2_nakagawa()` now returns r-squared for models with singular fit, where no
  random effect variances could be computed. The r-squared then does not take
  random effect variances into account. This behaviour was changed to be in line
  with `MuMIn::r.squaredGLMM()`, which returned a value for models with singular
  fit.

* `check_distribution()` now detects negative binomial and zero-inflated
  distributions. Furthermore, attempt to improve accuracy.

* `check_distribution()` now also accepts a numeric vector as input.

* `compare_performance()` warns if models were not fit from same data.

## New check-functions

* `check_homogeneity()` to check models for homogeneity of variances.

## Bug fixes

* Fixed issues with `compare_performance()` and row-ordering.

* Fixed issue in `check_collinearity()` for zero-inflated models, where the
  zero-inflation component had not enough model terms to calculate
  multicollinearity.

* Fixed issue in some `check_*()` and `performance_*()` functions for models
  with binary outcome, when outcome variable was a factor.

# performance 0.2.0

## General

* `r2()` now works for more regression models.

* `r2_bayes()` now works for multivariate response models.

* `model_performance()` now works for more regression models, and also includes
  the log-loss, proper scoring rules and percentage of correct predictions as
  new metric for models with binary outcome.

## New performance-functions

* `performance_accuracy()`, which calculates the predictive accuracy of linear
  or logistic regression models.

* `performance_logloss()` to compute the log-loss of models with binary outcome.
  The log-loss is a proper scoring function comparable to the `rmse()`.

* `performance_score()` to compute the logarithmic, quadratic and spherical
  proper scoring rules.

* `performance_pcp()` to calculate the percentage of correct predictions for
  models with binary outcome.

* `performance_roc()`, to calculate ROC-curves.

* `performance_aicc()`, to calculate the second-order AIC (AICc).

## New check-functions

* `check_collinearity()` to calculate the variance inflation factor and check
  model predictors for multicollinearity.

* `check_outliers()` to check models for influential observations.

* `check_heteroscedasticity()` to check models for (non-)constant error
  variance.

* `check_normality()` to check models for (non-)normality of residuals.

* `check_autocorrelation()` to check models for auto-correlated residuals.

* `check_distribution()` to classify the distribution of a model-family using
  machine learning.

## New indices-functions

* `r2_mckelvey()` to compute McKelvey and Zavoinas R2 value.

* `r2_zeroinflated()` to compute R2 for zero-inflated (non-mixed) models.

* `r2_xu()` as a crude R2 measure for linear (mixed) models.

## Breaking changes

* `model_performance.stanreg()` and `model_performance.brmsfit()` now only
  return one R2-value and its standard error, instead of different (robust) R2
  measures and credible intervals.

* `error_rate()` is now integrated in the `performance_pcp()`-function.

## Changes to functions

* `model_performance.stanreg()` and `model_performance.brmsfit()` now also
  return the _WAIC_ (widely applicable information criterion).

* `r2_nakagawa()` now calculates the full R2 for mixed models with
  zero-inflation.

* `icc()` now returns `NULL` and no longer stops when no mixed model is
  provided.

* `compare_performance()` now shows the Bayes factor when all compared models
  are of same class.

* Some functions get a `verbose`-argument to show or suppress warnings.

## Bug fixes

* Renamed `r2_coxnell()` to `r2_coxsnell()`.

* Fix issues in `r2_bayes()` and `model_performance()` for ordinal models resp.
  models with cumulative link (#48).

* `compare_performance()` did not sort the `name`-column properly, if the
  columns `class` and `name` were not in the same alphabetical order (#51).

