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RR interval feature series.
| Features Series | Descriptions |
|---|---|
| RR0 | Current RRi value |
| RR-1 | Previous RRi value |
| RR+1 | Next RRi value |
| RR0/avgRR | Current RRi/average of RRi within 42 s |
| tRR0 | (CurrentRR-averageRR)/stddevRR |
| RR-1/avgRR | Previous RRi/average of RRi |
| RR-1/RR0 | Previous RRi/ current RRi within 42 s |
| RR+1/avgRR | Next RRi, average of RRi within 42 s |
| RR+1/RR0 | Next RRi, current RRi |
