Binned residuals for binomial logistic regression
Check model for independence of residuals.
Check suitability of data for clustering
Check for multicollinearity of model terms
Convergence test for mixed effects models
Check correct model adjustment for identifying causal effects
Classify the distribution of a model-family using machine learning
Check suitability of data for Factor Analysis (FA) with Bartlett's Test of Sphericity and KMO
Check variables for within- and/or between-group variation
Check model predictor for heterogeneity bias _(Deprecated)_
Check model for (non-)constant error variance
Check model for homogeneity of variances
Check if a distribution is unimodal or multimodal
Check model for (non-)normality of residuals.
Outliers detection (check for influential observations)
Check overdispersion (and underdispersion) of GL(M)M's
Check distribution of simulated quantile residuals
Check for zero-inflation in count models
Print tables in different output formats
Discrimination and Item-Total Correlation of Questionnaire Items
LOO-related Indices for Bayesian regressions.
Performance of instrumental variable regression models
performance: An R Package for Assessment, Comparison and Testing of Statistical Models
Residual Standard Error for Linear Models
Somers' Dxy rank correlation for binary outcomes
Tjur's R2 - coefficient of determination (D)
Simulate randomized quantile residuals from a model

functions to check model assumptions and and assess model quality