Utilities for computing measures to assess model quality, which are not directly provided by Rs base or stats' packages. These include e.g. measures like r-squared, intraclass correlation coefficient (Nakagawa, Johnson & Schielzeth (2017) <doi:10.1098/rsif.2017.0213>), root mean squared error or functions to check models for </doi:10.1098/rsif.2017.0213>…