What is usually the basis for data collection in a functional analysis?

In a functional analysis, the basis for data collection primarily focuses on frequency. This approach involves observing and recording how often a specific behavior occurs within a defined time period. By tracking the frequency of the behavior, practitioners can identify patterns, triggers, and the function of the behavior in different contexts. This method aids in determining the antecedents and consequences that influence the behavior, which is critical for developing effective interventions.

The other options like time, percentage, and duration may play a role in data collection in various contexts, but they do not specifically capture the essence of frequency that is pivotal in functional analysis. Frequency provides clear and quantifiable data that helps practitioners make informed decisions about behavioral interventions.