Anomaly Detection

Phase 2False Positive Rate: 4.2%

Weekly Anomaly Digest

March 3-9, 2026

2 Critical5 Warning1 Info
CriticalZ-Score

Unusual Drop in Course Completion Rate

Business Analytics 101 completion rate dropped from 72% to 45% this week, 3.2 standard deviations below the 8-week moving average.

Metric: Completion RateChange: -37.5%

8-week trend

CriticalIsolation Forest

Spike in Student Drop-off Rate

Cybersecurity Essentials saw 23 students unenroll in 3 days, 4.1 standard deviations above normal weekly attrition of 2-3 students.

Metric: Drop-off RateChange: +767%

8-week trend

WarningZ-Score

Login Frequency Decline Across Fall Cohort

2024 Fall Cohort average logins dropped from 4.2/week to 2.8/week over 3 weeks, indicating engagement fatigue.

Metric: Login FrequencyChange: -33.3%

8-week trend

WarningIsolation Forest

Grade Distribution Shift in Data Science

Mean grade dropped from 76 to 68 in Week 6, with bimodal distribution suggesting content gap.

Metric: Average GradeChange: -10.5%

8-week trend

WarningZ-Score

Forum Activity Surge in Machine Learning

Forum posts increased 280% in 2 days, driven by confusion about Assignment 4 requirements.

Metric: Forum PostsChange: +280%

8-week trend

WarningZ-Score

Submission Timeliness Degradation

Late submissions in Web Development increased from 8% to 22% over last 3 assignments.

Metric: Late SubmissionsChange: +175%

8-week trend

WarningIsolation Forest

Time-to-Complete Increase

Average time to complete Module 2 in Financial Accounting increased from 5.2 to 8.1 days.

Metric: Time to CompleteChange: +55.8%

8-week trend

InfoZ-Score

Enrollment Rate Above Expected

Public Speaking received 45 new enrollments this week vs. 18 weekly average. Likely driven by marketing campaign.

Metric: EnrollmentsChange: +150%

8-week trend