To handle ABA sessions with zero eligible opportunities, record the session and classify why no opportunity occurred. A true zero response requires at least one eligible opportunity. With zero opportunities, a response percentage is undefined, not zero percent. Separate cancelled exposure, access or system failure, missing observation, and an inapplicable session. Keep each state visible in tables and graphs.

Define a true zero

Use zero only when the response was observed zero times during a valid exposure or opportunity set.

Classify why opportunities were absent

Distinguish schedule, environment, partner, access, health, withdrawal, cancellation, and measurement-system causes.

Keep the session in the cohort

Report zero-opportunity sessions divided by sessions due and age unresolved system failures. Avoid dropping them from every summary.

Graph an explicit state

Use a gap or coded marker with a note. Do not plot the undefined percentage at zero or connect a trend line through it.

Use the formula and its units for Zane

For Zane's zero-opportunity session classification: response percentage = responses / eligible opportunities × 100; when eligible opportunities = 0, the percentage is undefined. Write the unit beside every result and keep the original numerator, denominator, time, opportunities, response definition, and condition. State rounding only after the unrounded calculation is preserved.

Work the arithmetic for Zane

Zane's community activity is cancelled, so the help-request opportunity count is 0. The record shows 0 eligible opportunities and no percentage. A later session has 0 responses in 3 eligible opportunities, which is a true 0 / 3 = 0%. These states support different decisions.

Apply the zero-opportunity classification to a decision

Zane's qualified clinician identifies the decision before selecting the summary or display. Compare at least one alternative unit or classification, inspect client access and direct experience, and record what evidence would change the interpretation. A correct calculation can still answer the wrong question.

Audit data states for Zane

Zane's record distinguishes valid observed values, true zeros, missing observations, invalid events, no opportunities, not-due records, late entries, corrections, and incompatible conditions. Give unresolved items an owner, age, and next action. Preserve the original evidence and the reason for every exclusion or change.

Protect access and context for Zane

Zane's measurement keeps AAC, interpreters, mobility, food, water, bathroom use, prescribed care, health support, rest, relationships, and emergency help available. Record ordinary supports, partner response, setting, schedule, burden, and withdrawal. The data system should describe care without creating unsafe or inaccessible test conditions.

Ask five calculation questions for Zane

Use these questions in the zero-opportunity session classification:

  • What exact response, event, opportunity, time exposure, unit, and condition does the value represent?
  • Which raw numerator, denominator, clock, source, and calculation reproduce it?
  • Which zero, missing, invalid, not-due, corrected, censored, or incompatible states stay separate?
  • Which client experience, access, integrity, agreement, burden, and context qualify interpretation?
  • Which clinical decision, alternative display, next evidence, owner, and review date follow?

Keep raw counts and units beside every derived value.

Use current sources within their scope for Zane

For Zane's zero-opportunity session classification, the BCBA Test Content Outline includes measurement, validity, reliability, sampling, graphing, assessment, and data-based decisions as examination content. It is not a case protocol. The BACB Ethics Code addresses competence, client involvement, consent and assent when applicable, documentation, risk, and evaluation for covered behavior analysts. The CASP public summary supplies high-level autism-treatment scope without publishing licensed detailed procedures.

For Zane, ASHA says AAC users should always have access to their communication tools or devices. The WWC Version 5.0 handbook supplies research-review standards, not universal clinical formulas, thresholds, or decision rules. None of these sources turns a derived metric into proof of effectiveness, safety, medical necessity, compliance, or causation.

Close Zane's measurement review

Ask Zane and the responsible clinician to review the zero-opportunity session classification through accessible communication. Record the raw data, calculation, unit, display, assumptions, missingness, context, interpretation limits, selected decision, next evidence, and review date. Reopen the analysis when the response definition, exposure, opportunity, setting, measurement system, client priority, or access changes.

Related resources

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