ggeffects: Tidy Data Frames of Marginal Effects for ggplot.

General

• Removed alias names mem(), eff() and ame().
• For mixed models (packages lme4, nlme, glmmTMB), the uncertainty of the random effect variances is now taken into account when type = "re".
• Computing confidence intervals for mixed models should be much more memory efficient now, resulting less often in warnings about memory allocation problems.
• Updated reference in CITATION to the publication in the Journal of Open Source Software.
• A test-suite was added to the package.

New functions

• pretty_range(), to create a pretty sequence of integers of a vector.

Changes to functions

• ggpredict() gets a condition-argument to specify values at which covariates should be held constant, instead of their typical value.
• The pretty-option for ggpredict() now calculates more values, leading to smoother plots.
• The terms-argument in ggpredict() can now also select a range of feasible values for numeric values, e.g. terms = "age [pretty]". In contrast to the pretty-argument, which prettyfies all terms, you can selectively prettify specific terms with this option.
• The terms-argument in ggpredict() now also supports all shortcuts that are possible for the mdrt.values-argument in gginteraction(), so for instance term = "age [meansd]" would return three values: mean(age) - sd(age), mean(age) and mean(age) + sd(age).
• plot() gets some new arguments to control which plot-title to show or hide: show.title, show.x.title and show.y.title.
• plot() gets a log.y argument to transform the y-axis to logarithmic scale, which might be useful for binomial models with predicted probabilities, or other models with log-alike link-functions.
• The plot()-method for plotting all effects with ggpredict() (when term = NULL) now allows to arrange the plot in facets (using facets = TRUE).
• Values in dot-argument for plot() are now passed down to ggplot::scale_y*(), to control the appearance of the y-axis (like breaks).

Bug fixes

• Fixed issue with binomial models that used cbind(...) as response variable.
• Fixed issue with suboptimal precision of confidence resp. prediction intervals for mixed models (packages lme4, nlme), which are now more accurate.