Which continuous measurement procedure is a ratio of count per observation time?

The correct answer is frequency, as it is indeed defined as a ratio of count per observation time. In the context of applied behavior analysis, frequency measures how many times a behavior occurs within a specified period. This measurement is vital for understanding the prevalence of a behavior and for making informed decisions regarding interventions or changes in treatment plans.

Frequency is recorded by counting the instances of a behavior and then relating this count to the duration of the observation period. For example, if a child engages in a certain behavior 15 times during a 30-minute observation, the frequency would be expressed as a count of 15 events per 30 minutes. This allows for a clear understanding of how often behaviors are occurring and can inform the effectiveness of behavioral interventions.

In contrast, the other options represent different measurement procedures: latency measures the time between a stimulus and the response, duration measures how long a behavior occurs, and interresponse time measures the time between two consecutive responses. Each of these offers meaningful data in behavior analysis but does not fit the definition of a count per observation time like frequency does.