Optimization of an Accelerometer and Gyroscope-Based Fall Detection Algorithm

Figure 4

The ROC curve. Optimal threshold shown as minimum distance, , to point (0, 1) where sensitivity () and specificity () are 100% and 100%, respectively. False positive rate equals 1 − specificity as an algorithm that results in 100% false positive has 0% specificity and one that has 0% false positive rate results in 100% specificity.