Notes
Notes
Short write-ups of things the projects taught me, mostly about data that isn't what it looks like.
- October 2026A pile of loans that wasn't about the guarantee
Two SBA programs had their own $150,000 ceiling. Their loans pile at the cutoff for a reason that has nothing to do with the guarantee.
- October 2026The loan file that rewrites itself
Some fields in the public SBA file change after a loan defaults. A model that uses them scores beautifully, and is useless.
- October 2026Rounding is not an accounting error
Earnings per share is reported to the cent. A tolerance that ignores that turns rounding into 3,897 false alarms.