A monitoring threshold triggers PSI > 0.20 as an alert. What type of drift does PSI specifically measure?
Select an answer to reveal the explanation.
Short Explanation
Here's the deal — PSI compares feature or score distributions between reference and monitoring periods, so it detects covariate drift, which is a change in P(X). It doesn't need target labels, so it won't tell you about concept or label drift.
Full Explanation
The correct answer is covariate drift: changes in the distribution of input features P(X). Population Stability Index compares score or feature distributions between reference and monitoring periods, so it detects covariate/data drift — changes in P(X). The option describing concept drift is wrong because it requires monitoring P(Y|X) with ground truth labels. The option describing label drift is wrong because it monitors P(Y). The option describing model drift is wrong because it is not a standard drift category.