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Data Collection and Graphing / LESSON 02

Read data and graphs without changing their meaning · RBT2026 Foundations

6 min + practice · Original foundation lesson

A graph is a record of defined measurements, not proof of why behavior changed.

Read the recording rule

Continuous observation and interval sampling answer different questions. Under partial-interval recording, one occurrence is enough to mark the interval. Under whole-interval recording, the behavior must occur for the entire defined interval. Momentary time sampling asks whether it is happening at the specified observation instant. Follow the assigned procedure exactly. A partial-interval score does not reveal how many responses occurred, and an occurrence in a whole interval does not replace a continuous duration record.

Use the denominator that was actually observed

In twelve observed partial intervals, six contain the response. The result is fifty percent of observed intervals. It is not evidence that the response occupied exactly half the session. A second observer using whole intervals might obtain a different percentage from the same stream of behavior because the scoring rules differ. This is not automatically an arithmetic mistake. Before comparing the values, check the definitions, sampling methods, interval length, and whether all planned observations were completed.

Inspect axes and missing observations

Read the horizontal axis, vertical axis, measurement unit and condition labels before describing a line. A point at four responses per minute is not the same measure as four total responses. A missed session should remain distinguishable from a completed observation with no responses. Do not join, backfill, erase or relabel observations merely to make a graph look smooth. Correct a data-entry error through the authorized correction process so that the actual observation and its correction remain traceable.

Describe a pattern before interpreting it

An upward sequence can be described as an increasing trend in the measured values. It does not, by itself, establish a treatment effect or a behavioral function. Ask whether the observations are comparable, whether variability is large, and whether a condition changed. Practice with values two, five, three and six: the final value exceeds the first, but there is also substantial fluctuation. Report that pattern accurately and bring questions about interpretation or program changes to the supervisor.

WORKED EXAMPLE

Which description is most suitable for an operational definition?

  1. Apply the relevant A.5 distinction: Observable definitions describe actions with clear measurement boundaries rather than inferred motives or labels.
  2. The hand movement is observable; the alternatives infer evaluation or internal motive.
  3. The response is interpreted within the stated observation conditions and RBT role; do not add an unsupported universal conclusion.
Answer: The learner moves the open hand above shoulder height and returns it below shoulder height.
Compare the other answer choices
The learner is disrespectful.

The choice 'The learner is disrespectful.' does not follow the specified observation or approved procedure. The hand movement is observable; the alternatives infer evaluation or internal motive.

The learner wants attention.

The choice 'The learner wants attention.' does not follow the specified observation or approved procedure. The hand movement is observable; the alternatives infer evaluation or internal motive.

The learner has a bad attitude.

The choice 'The learner has a bad attitude.' does not follow the specified observation or approved procedure. The hand movement is observable; the alternatives infer evaluation or internal motive.

Try it, then explain it.

Complete a short set without looking at the example. After each answer, explain which evidence or rule supports your decision and why the alternatives do not fit.

Practice this skill

Sources & authorship

Original Slope explanations and examples. References support the concepts; they are not the source of copied questions. Independent educator review is pending.

RBT Test Content Outline3rd editionRegistered Behavior Technician official overview
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Use this topic in your study path

  • Read the recording rule
  • Use the denominator that was actually observed
  • Inspect axes and missing observations