Due to the precautionary measures during the COVID-19 pandemic many universities offered unproctored take-home exams. We propose methods to detect potential collusion between students and apply our approach on event log data from take-home exams during the pandemic. We find groups of students with suspiciously similar exams. In addition, we compare our findings to a proctored control group. By this, we establish a rule of thumb for evaluating which cases are "outstandingly similar", i.e., suspicious cases.

翻译：受新冠疫情防控措施影响，许多高校开展了无监考居家考试。本文提出检测学生间潜在合谋行为的方法，并将该方法应用于疫情期间居家考试的事件日志数据。我们发现了考试内容异常相似的学生群体。此外，我们将研究结果与有监考对照组进行对比，据此建立经验法则用于评估哪些案例属于"异常高度相似"的疑似作弊情形。