Overview of statistical measures: relative power, Lempel-Ziv complexity, and lossless compression ratio.
| Measure|| Description|| References|
| Relative power||Power within specific EEG frequency band normalized by total power|||
| Frequency bands: 0.5–4 Hz (delta), 4–8 Hz (theta), 8–10 Hz (alpha 1), 10–12 Hz (alpha 2), 12–30 Hz (beta)|
| Lempel-Ziv complexity||Number of different patterns present in an EEG signal (complexity measure)|||
| Lossless compression ratio||Reduction of the size of EEG data after lossless compression (regularity measure)||[14, 15]|
|Compression algorithms considered here: 1D SPIHT, 2D SPIHT, and 2D SPIHT followed by arithmetic coding|