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Continuous vs Discontinuous Measurement

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Jerval Johnson

on 24 July 2015

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Transcript of Continuous vs Discontinuous Measurement

Continuous vs Discontinuous Measurement
Advantages of Continuous
Measurement
Partial Interval Recording - allows other behaviors to be monitored after the target behavior has occurred
Whole Interval Recording - GREAT for behavior that occur at a high rate.
Momentary Time Sampling - The behavior does not have to be attended to until the end of the interval
Disadvantages of Continuous Measurement
Partial Interval Recording - overestimates the total duration of the behavior and underestimates the frequency of high rate behaviors
Whole Interval Recording - The behavior has to be observed for the entire interval and can underestimate the occurrence of the behavior
Momentary Time Sampling - Overestimates AND underestimates the duration when the interval time is greater than 2 minutes.
What is measurement?
Cooper, Heron, and Heward define measurement as the process of applying qualitative labels to observed properties of events using a standard set of rules
Continuous Measurement
Continuous measurement involves measuring all of the instances of a response class are observed during an observation period.
Types of Continuous Measurement:
Partial Interval Recoding - whether a behavior occurred at ANY time during the interval
Whole Interval Recording - whether the behavior occurred during the ENTIRE interval
Momentary Time Sampling - whether the behavior is occurring at the MOMENT the interval ENDS
What is Discontinuous Measurement?
Incomplete measurement where all responses during the observation period are not necessarily detected.
Types of Discontinuous Measurement
Percentage - a ratio of the number of responses of a certain behavior.
Trials to Criterion - a measure of the number of responses needed for accuracy
Disadvantages of Discontinuous Measurements
Poses a threat to validity
Observation periods may be inconsistent , too long, or too short
Insensitive or limited measurement scales may be used.
Observers may be poorly training
Advantages of Discontinuous Measurement
Can be recorded for an entire observation session.
Can be used to compare the efficacy of two or more treatments.
Can be used to determine a learner's increasing proficiency in an area.
Reference:
Cooper, J., Heron, T. and Heward, W. (2007) Applied Behavior Analysis (2nd Ed.) Upper Saddle River, NC: Pearson.
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