Average Reliability for all channels is in the Reliability Window on the left margin of the edit screen as well as reliability per channel.   Scan through the reliability of different channels.  Split-half reliability is the ratio of the variance of the even 1 second samples of EEG digital samples divided by the odd 1 second segments of the EEG edited selection.   Test re-test reliability is the ratio of variance in the first half of the EEG selections vs. the second half of the EEG selections.

Higher moment to moment variability is related to a decrease in the split-half reliability and state change variability, e.g., Drowsiness, is related to a decrease in the test re-test reliability.