Big Data and Business Analytics

Extracting Useful Information from Multivariate Temporal Data  •  181

at 4.85 percent false- positive rate, and the area under the ROC curve

(AUC) score of 0.857. Figure11.3 depicts an example result obtained in

one patient with the presented method. e positive exceedance CuSum

events (depicted with light gray spikes, their moving average frequency

shown in dark gray in the top diagram) were obtained from one of the

principal components of the blood pressure signal. e spikes in the bot-

tom diagram indicate critical tachycardia episodes to be predicted. As

can be seen, the frequency of indicator events visibly escalates a few hours

prior t ...