Case Controls
Configure the investigation before starting.
Data and Session
Keyboard: 1 safe, 2 possible, 3 definite, H hint.
Score
0
Accuracy, confidence, and speed
Timer
03:00
Pause freezes the case
Case Progress
0/0
Classified feature cards
Detective Rank
Data Rookie
Stored locally on this browser
Select a case and start
No active caseDrag each feature card into the appropriate evidence zone.
Safe
Possible
Definite
No feature selected.
Detective Tools
Use tools carefully. Each hint reduces the maximum score.
Tool output
Start a case, select a feature, then choose an investigation tool.
Prediction-Time Timeline
Features available after the cutoff can create future-information leakage.
Historical dataPrediction cutoffOutcome known
Availability check
Select a card to inspect when its value becomes available.
Pipeline Repair Board
Drag steps into a safe order. Evaluation data must remain isolated.
Start a case to load pipeline steps.
Learning Reference
Use this checklist before trusting any validation score.
Leakage warning signs
- Near-perfect validation with ordinary features.
- A feature is recorded after the event.
- One identifier dominates feature importance.
- Deployment performance collapses.
- Duplicates cross validation folds.
Safe validation checklist
- Split before fitting preprocessing steps.
- Fit transforms inside each training fold.
- Use grouped or chronological validation when required.
- Reserve the test set for final evaluation.
- Verify every feature exists at prediction time.