Fig. 2
From: Utilizing heart rate variability to predict ICU patient outcome in traumatic brain injury
A diagram of the proposed method. APACHE II, APACHE III and SAPS scores were calculated based on medical records. HRV parameters were calculated based on the patient ECG data, and these parameters and the distribution of each of the HRV parameters across each of 8 continuous time points were used as the input variables (features) to the classification model. The classification model used here is logistic regression. A genetic algorithm (GA) was used for feature selection to find variable combinations that build the most accurate prediction model.