Month 2024-11 – Focus: lsst/analysis_tools. Key accomplishment: fixed Rho statistics size residual computation by updating the calculation 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 resolves a misalignment in residual reporting, improving the accuracy of PSF-related size metrics. Commit: 5402ce435414361406c7027c98836b70b271afba ('Change the definion of calcSizeResidual'). Business value: higher data quality for PSF sizing, reduced downstream debugging, and more reliable instrument modeling. Demonstrates proficiency in Python data analysis, unit testing considerations, and version control.