Definition
Frequency, or event, recording tallies every instance of a discrete, countable behavior. It works best for behaviors with a clear beginning and end and a moderate rate — hitting, raising a hand, requesting.
Frequency is often converted to rate (count per unit time) so data collected across sessions of different lengths can be compared.
Example
An RBT tallies each instance of hand-raising during a 30-minute session: 12 occurrences.