Leakage Prevention
Leakage Prevention groups the core ideas a learner needs at the 6 · splitting, validation & experiment design stage. Work through the lessons in order when new to the area, or use them independently as a reference when implementing an analysis.
Learn the mechanism one decision at a time
Work through the lessons in order if the topic is new. If you already know the basics, open the specific leaf lesson that matches the operation, diagnostic or failure mode you need.
1Definition→
2Mechanism→
3Example→
4Diagnostic→
5Decision
Target leakageTarget leakage is a practical concept within Leakage Prevention. It helps turn the broader workflow stage “6 · Splitting, Validation & Experiment Design” into an explicit analytical decision that can be explained, implemented and checked. The concept should be understood in terms of purpose, mechanism, assumptions, evidence and downstream consequences.
02Preprocessing leakagePreprocessing leakage is an evaluation quantity that compresses a particular aspect of predictive behaviour into a number. Its usefulness depends on whether that aspect matches the real decision cost, class prevalence and intended model output.
03Feature-selection leakageFeature-selection leakage changes how raw variables are represented for analysis or modelling. The transformation should preserve the information needed by the task while making assumptions explicit and reproducible.
04Group leakageGroup leakage is a practical concept within Leakage Prevention. It helps turn the broader workflow stage “6 · Splitting, Validation & Experiment Design” into an explicit analytical decision that can be explained, implemented and checked. The concept should be understood in terms of purpose, mechanism, assumptions, evidence and downstream consequences.
05Temporal leakageTemporal leakage is a practical concept within Leakage Prevention. It helps turn the broader workflow stage “6 · Splitting, Validation & Experiment Design” into an explicit analytical decision that can be explained, implemented and checked. The concept should be understood in terms of purpose, mechanism, assumptions, evidence and downstream consequences.
06Duplicate leakageDuplicate leakage is a practical concept within Leakage Prevention. It helps turn the broader workflow stage “6 · Splitting, Validation & Experiment Design” into an explicit analytical decision that can be explained, implemented and checked. The concept should be understood in terms of purpose, mechanism, assumptions, evidence and downstream consequences.
07Hyperparameter-selection leakageHyperparameter-selection leakage is a practical concept within Leakage Prevention. It helps turn the broader workflow stage “6 · Splitting, Validation & Experiment Design” into an explicit analytical decision that can be explained, implemented and checked. The concept should be understood in terms of purpose, mechanism, assumptions, evidence and downstream consequences.
08Pipeline design as leakage controlPipeline design as leakage control changes how raw variables are represented for analysis or modelling. The transformation should preserve the information needed by the task while making assumptions explicit and reproducible.