ABAT Measurement and Data Collection 3 — Questions and Answers
Question 1: On a standard ABA line graph, what does the x-axis represent?
- Behavior frequency or rate
- Sessions or time sequence (Correct answer)
- Intervention condition labels
- Interobserver agreement scores
Correct answer: Sessions or time sequence
The x-axis (horizontal) displays the sequential order of observations or sessions so that changes over time can be tracked.
Question 2: A cumulative record differs from a standard equal-interval line graph in that the cumulative record:
- Displays each data point independently of all others
- Only plots response rate data
- Can never decrease as behaviors are added (Correct answer)
- Requires semi-logarithmic axis scaling
Correct answer: Can never decrease as behaviors are added
Each new occurrence is added to the running total, so the data path can only stay flat or rise, never fall.
Question 3: The Standard Celeration Chart (SCC) uses what type of y-axis scaling?
- Linear (equal interval)
- Ratio (logarithmic) (Correct answer)
- Ordinal (ranked)
- Percentage (0–100)
Correct answer: Ratio (logarithmic)
The SCC uses a ratio (log) y-axis so that equal vertical distances represent equal multiplication factors of behavior rate, making acceleration visible.
Question 4: In visual analysis, 'trend' within a phase refers to:
- The average level of data points in that phase
- The systematic directional change in data across sessions (Correct answer)
- The spread of data points around the phase mean
- The abrupt shift in level at a phase boundary
Correct answer: The systematic directional change in data across sessions
Trend describes whether data are systematically increasing, decreasing, or remaining stable (zero trend) within a phase.
Question 5: Which set of features is evaluated when conducting within-phase data analysis?
- Immediacy, overlap, and replication
- Level, trend, and variability (Correct answer)
- Baseline length, phase change, and IOA
- Validity, reliability, and reactivity
Correct answer: Level, trend, and variability
Within-phase analysis examines the central level (mean or median), the trend direction, and the degree of variability among data points.
Question 6: A behavior analyst observes a steadily increasing trend in baseline data. Why is this problematic when planning an intervention?
- It suggests the measurement system is malfunctioning
- The behavior may improve on its own without intervention, threatening internal validity (Correct answer)
- It indicates the intervention is already taking effect
- It makes IOA calculations unreliable
Correct answer: The behavior may improve on its own without intervention, threatening internal validity
An upward baseline trend means the behavior is already changing, making it difficult to attribute subsequent improvement to the intervention.
Question 7: In visual analysis of a behavior change graph, 'immediacy of effect' refers to:
- The time it takes an observer to record data after a response
- How rapidly and abruptly data change at the point of phase transition (Correct answer)
- The latency of the target behavior itself
- The speed at which IOA is calculated post-session
Correct answer: How rapidly and abruptly data change at the point of phase transition
Immediacy of effect evaluates how quickly behavior changes at the phase change point; a sharp, immediate shift strengthens the inference of a causal relationship.
ABAT Measurement and Data Collection 3
On a standard ABA line graph, what does the x-axis represent?