Type II error, also known as a false negative, is a concept in statistics and artificial intelligence that occurs when a hypothesis or a model incorrectly fails to identify a condition as true when it is actually true. In other words, it’s an error that happens when a model fails to detect something that is present. Type II error is particularly relevant in binary classification problems, where the goal is to determine the absence or presence of certain characteristics or conditions.
Type II errors have significant implications in various applications, including medical testing, quality control, and security systems. For example, in a medical context, a Type II error could occur if a patient with an actual medical condition goes undetected by a diagnostic test, leading to delayed treatment and potentially worsened health outcomes.
Minimizing Type II errors is essential for ensuring the effectiveness of models and systems. Researchers and practitioners often adjust the model’s parameters or decision thresholds to strike a balance between Type I errors (false positives) and Type II errors. By carefully selecting these thresholds and considering the costs and consequences associated with each type of error, AI systems can be designed to make accurate and reliable predictions, minimizing the risk of failing to identify important conditions or characteristics.
« Back to Glossary Index