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Table 4 The 4 groups of the example 2

From: Using n-gram analysis to cluster heartbeat signals

No. Group Subject Description Source
1. Apnea (APNEA) 20 This experiment uses the class ‘A’ set which includes 20 records for the target set of Apnea. These records meet all Apnea criteria. Recordings in class A contain at least one hour with an apnea index of 10 or more, and at least 100 minutes with apnea during the recording. It takes 8 hours for each sample (around 35,000 RRI). Apnea-ECG database [23]
2. Health Young (HY) 20 10 females and 10 males, average age 55.5 years. It takes 2 hours for each sample (around 7,100 RRI). Fantasia Database [20, 21]
3. Health Elderly (HE) 20 10 females and 10 males, average age 74.5 years. It takes 2 hours for each sample (around 7,200 RRI).
4. White Noise (WNU) 20 Uniform distribution. It takes 6 hours for each sample (around 15,000 RRI). Artificially generated
  Total 80