Consistency study of sternum manubrium percussion using phase space

Presents the consistency of percussion in a clinical environment. By measuring the input to the system and then obtaining the response to such a stimulus one is then able to model the system as a transfer function, assuming that nonlinearity is not significant. However, in order to eliminate the need to measure the input to the system one is required to determine besides general consistency the input characteristics across different medical personnel. This work shows that the input is consistent, providing one has experienced percussion. The authors present Phase Space portraits (measured signal against its first derivative) since graphical representation is substantially easier to cross compare than blind statistics which alone generally do not have an intuitive meaning