Monitoring area
Drift & stability
Compare distributions using frozen reference windows and explain sample-size and binning limits.
Drift & stabilityDrift & stabilityDrift & stabilityDrift & stability
Calculate PSI with frozen bins and visible counts
Reproduce the report’s population stability index and understand what its binning choices can conceal.
Show how smoothing changes sparse-bin drift diagnostics
Inspect pseudocounts, unequal sample sizes and empty bins before treating a PSI result as evidence.
Interpret a standardized mean shift as a descriptive scale
Reproduce the baseline-standardized mean difference and separate it from a hypothesis test.
Investigate drift without claiming that it caused a loss
Separate observed feature change, data defects, predictive deterioration and investment outcomes.