Repeated measures analysis of variance

Analysis of variance of measures that are repeatedly observed on the same respondents, who thus serve as their own controls.  Such a within-subject design has two advantages: more data per participant and more power because between-subject differences can be factored out of the error term.  An important assumption in such designs is that of sphericity.  …

Reliability

The extent to which a measure, procedure or an instrument yields the same result with repeated testing.  See Cohen’s kappa coefficient, Error score, Internal consistency, Inter-rater reliability, Measurement efficacy, Measurement error, Multitrait-multimethod matrix, Replicability, Validity

REM sleep

Abbreviation for ‘rapid-eye movement sleep, referred to also as paradoxical or active sleep, and one of the five EEG sleep stages identified by the eyes moving side-to-side underneath the lids and by electrophysiological wave signals emitted by the brain that are relatively fast, short in height, and somewhat erratic (as is heart rate and breathing …