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Elementary Secondary Education	1
Estimation (Mathematics)	1
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Journal of Special Education

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Ottenbacher, Kenneth J.

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Journal Articles	1
Reports - Evaluative	1

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When Is a Picture Worth a Thousand p Values? A Comparison of Visual and Quantitative Methods to Analyze Single Subject Data.

Peer reviewed

Ottenbacher, Kenneth J. – Journal of Special Education, 1990

The agreement between visual analysis and the results of the split-middle method of trend estimation was examined using a set of 24 stimulus graphs and 30 raters. Results revealed poor agreement between the two methods, and low sensitivity, specificity, and predictive ability for visual analysis in relation to statistical inferences. (JDD)

Descriptors: Elementary Secondary Education, Estimation (Mathematics), Evaluation Methods, Graphs