A snow-route model was trained only on weekday downtown plow logs because those trucks already had sensors. Weekend residential cul-de-sacs never appear in the file. A high F1 on the downtown slice is being celebrated. What should the team flag first?
Select an answer to reveal the explanation.
Short Explanation
Think of practicing only downtown weekdays, then celebrating the score while weekend cul-de-sacs never made the file. That is collection bias: the sample does not represent the routes you must plow. A high downtown F1 does not guarantee the streets you never measured.
Full Explanation
If the training file was collected only where sensors already existed, the sample is biased and will not represent weekend cul-de-sacs. That is a data-collection problem in the lifecycle, not something to defer to a later policy write-up. Clock speed is not the missing-route issue. A high F1 on downtown weekdays does not guarantee performance on the routes that were never collected.