Abstract
This chapter provides readers with a thorough understanding of Rasch person measures, practice interpreting Winsteps output tables containing person measures, and how (and why) these measures are used for parametric statistical tests. Readers are asked to rerun the data from Chap. 3, and then they are provided with step-by-step interpretation of the key columns presented in the “person measure” tables. Readers learn how to identify the number of items a respondent has answered and the Rasch measure computed for each person. Readers will also learn how to save person measures in a variety of formats for subsequent statistical analysis using software such as SPSS and SAS. In this chapter, readers also learn how to use USCALE and UMEAN in a control file, to create a user-friendly Rasch measure scale. The final topic in this chapter is the introduction of cross plots, in which the authors demonstrate that using UMEAN and USCALE does not alter the manner in which persons are measured. 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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Notes
- 1.
n.b. Winsteps and Ministeps are the identical program, the only difference is since Ministeps is free there is a limit to the number of items and persons which can be evaluated. This means almost all that one sees on a screen will be identical for Ministeps and Winsteps.
References
Enochs, L. G., & Riggs, I. M. (1990). Further development of an elementary science teaching efficacy belief instrument: A pre-service elementary scale. School Science and Mathematics, 90(8), 694–706. doi:10.1111/j.1949-8594.1990.tb12048.x.
Linacre, J. M., & Wright, B. D. (1989). The “length” of a logit. Rasch Measurement Transactions, 3(2), 54–55.
Additional Readings
A very good discussion of the problems with using raw data.
Wright, B. D. (2001). Counts or measures? Which communicate best? Rasch Measurement Transactions, 14(4), 784.
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Boone, W.J., Staver, J.R., Yale, M.S. (2014). Understanding Person Measures. In: Rasch Analysis in the Human Sciences. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-6857-4_4
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