DHARMa
An R package for residual diagnostics for hierarchical (multi-level / mixed) regression models.
Diagnostics for HierArchical Regression Models.
DHARMa uses a simulation-based approach to create readily interpretable scaled (quantile) residuals for fitted generalized linear (mixed) models. The resulting residuals are standardised to values between 0 and 1 and can be interpreted as intuitively as residuals from a linear regression — which makes model checking for GLMMs far more tractable than it usually is.