During November 2024, Chris Hebert focused on improving data quality in the lsst/analysis_tools repository by addressing a bug in the computation of Rho statistics size residuals. He updated the calculation in calcRhoStatistics.py, changing the residual formula from (T_obs-T_psf)/T_psf to (T_obs-T_psf)/T_obs and introducing a sign flip to align with the T_psf - T_model residual definition. This adjustment resolved inconsistencies in residual reporting, leading to more accurate PSF size metrics and reducing downstream debugging. Chris applied his expertise in Python, data analysis, and scientific computing, demonstrating careful attention to statistical correctness and code maintainability.