An AI model monitoring program reports that population stability index (PSI) values for several key input features have exceeded 0.25 over the past quarter. What action is MOST appropriate?
Select an answer to reveal the explanation.
Short Explanation
When PSI values exceed 0.25, you've crossed a major drift signal that can undermine the model's assumptions. You need to trigger a validation review and assess whether recalibration or redevelopment is needed.
Full Explanation
A PSI above 0.25 is the industry-standard threshold indicating significant population shift that likely invalidates model assumptions. This requires a formal validation review to assess model fitness, not just documentation. Simply documenting the PSI values and continuing monitoring ignores a material signal. Raising the PSI threshold to 0.35 suppresses legitimate alerts and weakens the monitoring program. Immediate retirement of the model and reversion to manual decision-making is premature before validation establishes whether the model is still performing adequately.