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CCH Chapter 5
Improving and Assessing the Quality of Behavioral Measurement
Terms in this set (24)
The extent to which observed values, the data produced by measuring an event, match the true state, or true values of the event as it exists in nature.
The extent to which the researcher convinces herself and others that the data are trustworthy and deserve interpretation. Measures of IOA are the most often used index of believability in ABA.
The process of comparing the data produced by a measurement system to a known standard or true value and, when sources of error are found, using that information to correct or improve the measurement system.
Measurement conducted in a manner such that all instances of the response class(es) of interest are detected during the observation period
Occurs when the behavior that is measured is the same as the behavior that is the focus of the investigation
measurement conducted in a manner such that some instances of the response class(es) of interest may not be detected
exact count-per-interval IOA
The percentage of total intervals in which two observers recorded the same count. The most stringent description of IOA for most data sets by event recording.
Occurs when the behavior that is measured is in some way different from the behavior of interest. Considered less valid than direct measurement because inferences about the relation between the data obtained and the actual behavior of interest required.
interobserver agreement (IOA)
The degree to which two or more independent observers report the same observed values after measuring the same events
= (number of intervals of agreement / total number of intervals) * 100%
An index of the agreement between observers for data obtained by interval recording or time sampling measurement.
mean count-per-interval IOA
The average percentage of agreement between the counts reported by two observers in a measurement period comprised of a series of smaller counting times
Nonrandom measurement error; a form of inaccurate measurement in which the data consistently overestimate or underestimate the true value of an event.
An observer who is unaware of the study's purpose and/or the experimental conditions in effect during a given phase or observation period. Data obtained by a naïve observer are less likely to be influenced by observers' expectations.
A measure produced by an observation and measurement system. Observed values serve as the data that the researcher and others will interpret to form conclusions about an investigation.
Any unintended change in the way an observer uses a measurement system over the course of an investigation that results in measurement error; often entails a shift in the observer's interpretation of the original definition of the target behavior subsequent to being trained.
Influence on the data reported by an observer that results from the observer's awareness that others are evaluating the data.
Refers to the consistency of measurement, specifically, the extent to which repeated measurement of the same event yields the same values.
An interobserver agreement index based only on the intervals in which either observer recorded the occurrence of the behavior
= (number of intervals of agreement) / (intervals in which either or both observers recorded occurrence) * 100%
total count IOA
The simplest indicator of IOA for event recording data; based on comparing the total count recorded by each observer per measurement period;
= (smaller of two observers' counts / larger of counts) * 100%
total duration IOA
A relevant index of IOA for total duration measurement; computed by dividing the shorter of the two durations reported by the observers by the longer duration and multiplying by 100.
The extent to which data obtained from measurement are directly relevant to the target behavior of interest and to the reason(s) for measuring it.
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