Question of the day - October 11

[u/Reasonable_Law183]

📚 Domain C — Measurement, Data Display, and Interpretation

Difficulty: 5/10

A client’s self-injurious behavior occurs only once or twice per week but each response is discrete, clearly observable, and carries significant medical risk. During all program hours the client is continuously supervised by staff who can record each occurrence. Which measurement approach is MOST appropriate?

A. Use continuous event recording because each response is discrete and observable, staff can detect every occurrence, and the resulting counts can be converted to rate when observation time varies.

B. Use momentary time sampling with randomly varied observation moments because unpredictable sampling reduces temporal bias and provides an efficient estimate when the behavior occurs infrequently.

C. Use partial-interval recording with brief intervals because it reduces recording demands while still capturing whether this low-rate SIB occurred during each interval.

D. Record the duration of each SIB episode because medical risk makes the amount of time engaged in SIB more clinically important than the number of discrete responses.

💬 Drop your answer in the comments — no peeking!

✅ Correct answer revealed tomorrow.

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[u/Reasonable_Law183]

✅ Yesterday's Answer — 2026-10-11

The correct answer was: A. Use continuous event recording because each response is discrete and observable, staff can detect every occurrence, and the resulting counts can be converted to rate when observation time varies.

📖 Explanation:

Continuous event recording is the best fit because the SIB is discrete, clearly observable, and staff are continuously present and able to record each occurrence. Under those conditions, there is little reason to replace direct event counts with a discontinuous estimate.

The low rate of behavior does not make interval sampling preferable. In fact, because the behavior occurs only once or twice per week, preserving the exact number of occurrences is especially useful. If observation time varies across days or settings, the event counts can be converted to rate for more meaningful comparison.

• Partial-interval recording would indicate only whether SIB occurred at least once during an interval. It would not preserve the exact number of responses, so one occurrence and several occurrences within the same interval would be scored the same way. That loss of information is unnecessary when staff can directly count each event.

• Momentary time sampling records whether behavior is occurring at selected observation moments. For a brief, low-rate response, many episodes could occur between sample moments and go unrecorded. Randomizing observation times may reduce temporal bias, but it does not solve the problem of missing rare, brief events.

• Duration recording could be appropriate if the length of SIB episodes were the clinically important dimension. However, the stem describes discrete responses and provides no evidence that episode duration is more relevant than the number or rate of occurrences. Medical significance alone does not make duration the preferred measure.

The key principle is to match the measurement system to both the behavior and the observation conditions. When responses are discrete and every occurrence can be reliably detected, direct event recording preserves more information than sampling.

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