A reminder why random row-splitting ruins longitudinal HR data (19k records, 2.3k people)
https://preview.redd.it/zm8dpl7ckzuh1.png?width=1448&format=png&auto=webp&s=c13cffacfec62d79c6d78400537ebbc3a4764108 Working on an employee churn prediction model with monthly records (19,104 rows across 2,381 unique employee IDs). It's tempting to just do train_test_split(df, test_size=0.2) and ce…
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- 2026-10-12 07:10 · r/learnmachinelearning
A reminder why random row-splitting ruins longitudinal HR data (19k records, 2.3k people)