Abstract
When researchers learn about Rasch, along with terms such as logit, person measure, item measure, and Wright maps, they will also learn about the ogive curve. The Winsteps score-measure table is used to aid readers in a creation of an ogive. Following this plotting of raw scores and measures, the chapter considers different pairs of students and how the same difference in raw scores is not the same difference in measures. The example is then extended to considering how the ogive impacts comparisons from a pre-time point to a post-time point. The final details involve showing that the meaning of the ogive does not change with rescaling through appropriate use of USCALE and UMEAN. The chapter finishes up with Keywords and Phrases, Quick Tips, Data Files, References, and Additional Readings. As in almost all chapters, sample analyses are used to reinforce the chapter topic.
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References
Linacre, J. M. (2006). Bernoulli trials, Fisher information, Shannon information and Rasch. Rasch Measurement Transactions, 20(3), 1062–1063.
Rasch, G. (1960). Probabilistic models for some intelligence and attainment tests. Copenhagen: Danish Institute for Educational Research.
Wright, B. D. (1997). Measurement for social science and education. A history of social science measurement. University of Chicago MESA (Measurement, Evaluation and Statistical Analysis) Research Memo 62.
Wright, B. D., & Stone, M. H. (1979). Best test design. Chicago: MESA Press.
Additional Readings
A very good comparison of the Rasch model and the 2P and 3P IRT models.
Wright, B. D. (1992a). IRT in the 1990s: Which models work best? Rasch Measurement Transactions, 6(1), 196–200.
Wright, B. D. (1992b, April). Opening remarks in an invited debate with Ron Hambleton. Presented at the annual meeting of the American Educational Research Association, San Francisco, CA. Retrieved April 22, 2013, from http://www.rasch.org/rmt/rmt61a.htm
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Boone, W.J., Staver, J.R., Yale, M.S. (2014). What Is an Ogive? How Do I Use It?. In: Rasch Analysis in the Human Sciences. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-6857-4_11
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DOI: https://doi.org/10.1007/978-94-007-6857-4_11
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