QUALITY_ZMAX
============

Python object: ``phenotypic.schema._quality_zmax.QUALITY_ZMAX``

Measurement info for the replicate-agreement modified Z-score QC check.

Documents the per-check extra columns behind the modified Z-score (ZMax)
agreement check, which scales each member's deviation from the group median
by the MAD to spot the colony that disagrees most with its replicates or
detection runs. A large modified Z-score often marks contamination, edge
artifacts, or segmentation errors rather than real biology, so these
columns drive curation decisions downstream of the QC pipeline.

.. list-table:: Category: **QC_ZMax**
   :header-rows: 1

   * - Column label
     - Description
     - Type
   * - ``QC_ZMax_Median``
     - Group median of the measurement.
     - :bdg-ref-secondary:`Quality <measurement-classification>`
   * - ``QC_ZMax_MAD``
     - Median absolute deviation used to scale the modified Z-score.
     - :bdg-ref-secondary:`Quality <measurement-classification>`
   * - ``QC_ZMax_NumMembers``
     - Members contributing to the statistic.
     - :bdg-ref-secondary:`Quality <measurement-classification>`