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| The extent to which observed values match the true values of the event as it exists in nature. |
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| The extent to which the researcher convinces herself and others that the data are trustworthy and deserve interpretation. Measures of inter observer agreement are the most often used index of this in ABA. |
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| Any procedure used to evaluate the accuracy of a measurement system and when sources of error are found to use that information to correct or improve the measurement system. |
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| Measurement conducted in a manner such that all instances of the response class(es) of interest are detected during the observation period. |
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| Occurs when the behavior that is measured is the same as the behavior that is the focus of the investigation. |
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| discontinuous measurement |
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| Measurement conducted in a manner such that some instances of the response class(es) of interest may not be detected. |
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| exact count-per-interval IOA |
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| The percentage of total intervals in which two observers recorded the same count; the most stringent description of IOA for most data sets obtained by event recording. |
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| Occurs when the behavior that is measured is in som 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 are required. |
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| interobserver agreement (IOA) |
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| The degree to which two or more independent observers report the same observed values after measuring the same events. |
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| An index of the agreement between observers for data obtained by interval recording or time sampling measurement; calculated for a given session or measurement period by comparing the two observer's recordings of the occurrence or nonoccurence of the behavior in each observation interval and dividing the number of intervals of agreement by the total number of intervals. |
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| mean count-per-interval IOA |
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| The average percentage of agreement between the count reported by two boosters in a measurement period comprised of a series of smaller counting times; a more conservative measure of IOA |
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| mean duration-per-occurrence IOA |
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| An IOA index for duration per occurrence data; also conservative |
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| Nonrandom measurement error; a form of inaccurate measurement in which the data consistently overestimate or underestimate the true value of an event. |
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| An observer who is unaware of the study's purpose and/or experimental conditions |
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| A measure produced by an observation and measurement system. |
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| An unintended change in the way an observer uses a measurement system over the course of an investigation. |
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| Influence on the data reported by an observer that results from the observer's awareness that other are evaluating the data he reports. |
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