assessor - Assessment Tools for Regression Models with Discrete and Semicontinuous Outcomes

Provides assessment tools for regression models with discrete and semicontinuous outcomes proposed in Yang (2021) <https://doi.org/10.1080/10618600.2021.1910042>, Yang (2024) <https://doi.org/10.1080/10618600.2024.2303336>, Yang (2024) <https://doi.org/10.1093/biomtc/ujae007>, and Yang (2026) <https://doi.org/10.1002/cjs.70046>. It calculates the double probability integral transform (DPIT) residuals. It also constructsQQ plots of residuals the ordered curve for assessing mean structures, quasi-empirical distribution function for overall assessment, and a formal goodness-of-fit test.