RBT RBT Task List 2nd Edition Measurement and Data 1 — Questions and Answers
Question 1: Which measurement method records whether a behavior occurred at least once during each interval, regardless of how many times it occurred?
- Whole interval recording
- Partial interval recording (Correct answer)
- Momentary time sampling
- Frequency recording
Correct answer: Partial interval recording
Partial interval recording scores an interval as positive if the behavior occurs at any point during that interval, even once.
Partial interval recording divides an observation period into equal intervals. An interval is marked as positive if the target behavior occurs at any point during the interval, even briefly. Because a single brief occurrence marks the entire interval, it tends to overestimate the true proportion of time the behavior occurs. It is most appropriate for behaviors that are difficult to count individually.
Question 2: An RBT measures how long it takes a student to begin a task after an instruction is delivered. This is a measure of:
- Duration
- Latency (Correct answer)
- Interresponse time
- Frequency
Correct answer: Latency
Latency is the time elapsed between the onset of a stimulus (instruction) and the beginning of the response.
Latency measures the elapsed time from the presentation of an antecedent stimulus (such as an instruction) to the onset of the target response. It is useful when the concern is how quickly a learner responds, not how long the behavior lasts. Duration, by contrast, measures how long a behavior continues once it has started. Interresponse time measures the time between successive responses.
Question 3: A client engages in hand-flapping. An RBT records every instance of the behavior each minute. This is an example of:
- Duration recording
- Whole interval recording
- Frequency (event) recording (Correct answer)
- Momentary time sampling
Correct answer: Frequency (event) recording
Frequency (event) recording tallies each individual occurrence of the behavior within an observation period.
Frequency recording, also called event recording, involves counting each discrete occurrence of the target behavior during an observation period. It is best suited for behaviors that have a clear beginning and end and occur at a moderate rate. Reporting frequency as a rate (responses per minute or hour) makes data comparable across sessions of different lengths.
Question 4: Which measurement method is most appropriate for behaviors that are very high-rate or that do not have a clear beginning and end?
- Frequency recording
- Latency recording
- Duration recording
- Time sampling (partial interval or MTS) (Correct answer)
Correct answer: Time sampling (partial interval or MTS)
Time sampling procedures are designed for continuous or high-rate behaviors because recording each discrete occurrence would be impractical.
When behaviors occur at a very high rate or are continuous (e.g., stereotypy, on-task behavior), it is difficult or impossible to count each individual occurrence. Time sampling methods—including whole interval, partial interval, and momentary time sampling—divide observation time into intervals and use each interval as the unit of measurement, making data collection feasible for these behavior types.
Question 5: Two RBTs simultaneously and independently observe the same client and record the same behavior. They compare their data afterward to assess consistency. This is called:
- Procedural fidelity
- Social validity
- Interobserver agreement (IOA) (Correct answer)
- Reliability coefficient
Correct answer: Interobserver agreement (IOA)
IOA (interobserver agreement) measures the degree of consistency between two independent observers recording the same behavior.
Interobserver agreement (IOA), sometimes called interrater reliability, involves two observers independently recording the same behavior during the same observation period, then comparing their records. High IOA (typically ≥80%) indicates the measurement system is objective and the data are likely accurate. The BCBA is responsible for establishing IOA procedures; the RBT participates by serving as one of the observers.
Question 6: Momentary time sampling (MTS) records whether a behavior is occurring:
- Throughout the entire interval
- At any point during the interval
- Only at the exact moment the interval ends (Correct answer)
- During at least half the interval
Correct answer: Only at the exact moment the interval ends
MTS records behavior only at the precise moment the interval ends (or begins), not throughout the interval.
In momentary time sampling, the observer records whether the behavior is occurring at exactly the moment the interval ends (or a pre-specified moment). Unlike partial interval recording, the behavior does not need to occur throughout or even during the majority of the interval—only at that single point in time. MTS tends to underestimate behaviors that occur briefly and overestimate behaviors that occur continuously, but it allows the observer to engage with the client between intervals.
Question 7: An RBT records the time from when a tantrum begins to when it ends for each occurrence. This is an example of:
- Latency recording
- Duration recording (Correct answer)
- Frequency recording
- Interresponse time recording
Correct answer: Duration recording
Duration recording captures how long a behavior lasts from onset to offset.
Duration recording measures the length of time a behavior occurs during each instance (per-occurrence duration) or across an entire observation session (total duration). It is most appropriate for behaviors that have a clear onset and offset and for which the concern is the length of the behavior, not just whether it occurred. Examples include time on-task, duration of self-injurious behavior episodes, or time out of seat.
RBT RBT Task List 2nd Edition Measurement and Data 1
Which measurement method records whether a behavior occurred at least once during each interval, regardless of how many times it occurred?