# Clifford Data Regression Clifford data regression (CDR) is a learning-based quantum error mitigation technique in which an error mitigation model is trained with quantum circuits that _resemble_ the circuit of interest, but which are easier to classically simulate {cite}`Czarnik_2021_Quantum, Lowe_2021_PRR`. ```{figure} ../img/cdr_workflow2_steps.png --- width: 700px name: cdr-workflow-overview --- The CDR workflow in Mitiq is fully explained in the {doc}`cdr-4-low-level` section. ``` Below you can find sections of the documentation that address the following questions: ```{toctree} --- maxdepth: 1 --- cdr-1-intro.md cdr-2-use-case.md cdr-3-options.md cdr-4-low-level.md cdr-5-theory.md ``` A simple tutorial using CDR can be found on the {doc}`cdr-1-intro` page.