An Angle Compared Index with Hybrid of Changes in the Ratio and Amplitude for Quantitative Evaluation of Disease Risk, Biological Function, and Biomarker Efficacy

Objective. The purpose of this study was to describe variations of different cardinal frequency by using angle compared index (ACI). Methods. The basic principle of the analysis model is to comprehensively consider changes in both the ratio and absolute value as follows: ACI = arctan (1-Pc) / [Pc(1-