binned_residuals        Binned residuals for logistic regression
check_convergence       Convergence test for mixed effects models
check_overdispersion    Check overdispersion of GL(M)M's
check_singularity       Check mixed models for boundary fits
check_zeroinflation     Check for zero-inflation in count models
cronbachs_alpha         Cronbach's Alpha for Items or Scales
error_rate              Error Rate for Logistic Regression Models
hosmer_lemeshow         Hosmer-Lemeshow goodness-of-fit test
icc                     The Intraclass Correlation Coefficient (ICC)
                        for mixed models
item_difficulty         Difficulty of Questionnaire Items
item_intercor           Mean Inter-Item-Correlation
item_reliability        Reliability Test for Items or Scales
item_split_half         Split-Half Reliability
looic                   LOO-related Indices for Bayesian regressions.
model_performance       Model Performance
model_performance.lm    Performance of (Generalized) Linear Models
model_performance.merMod
                        Performance of Mixed Models
model_performance.stanreg
                        Performance of Bayesian Models
mse                     Mean Square Error of Linear Models
principal_components    Principal Components Analysis
r2                      Compute the model's R2
r2_bayes                Bayesian R2
r2_coxnell              Cox & Snell's R2
r2_kl                   Kullback-Leibler R2
r2_loo                  LOO-adjusted R2
r2_mcfadden             McFadden's R2
r2_nagelkerke           Nagelkerke's R2
r2_nakagawa             Nakagawa's R2 for mixed models
r2_tjur                 Tjur's R2 - coefficient of determination (D)
rmse                    Root Mean Squared Error of Linear Models
rse                     Residual Standard Error for Linear Models
