ABA Exam CoachLessons · C. Measurement, Data Display, and Interpretation
C.8 · Validity, accuracy, and reliability
Two observers agree 95% of the time, so the data must be good, right? Not so fast. Today we'll learn the three questions to ask before you trust any measurement.
Key takeaway
Validity asks whether you're measuring the behavior that matters, in the right dimension, at representative times. Accuracy asks whether the data match the true values. Reliability asks whether you get the same values when you measure the same events again. High IOA tells you the data are believable. It doesn't prove they're accurate or valid.
Validity asks whether you're measuring the behavior that matters, in the right dimension, at representative times. Accuracy asks whether the data match the true values. Reliability asks whether you get the same values when you measure the same events again. High IOA tells you the data are believable. It doesn't prove they're accurate or valid.
Members get the full lesson video, notes and a 5-question test
The video walks through the idea, worked examples, the trap people fall into and an exam-style question. The notes and the checkpoint come with it, and your results feed your Where to focus plan.