Download Applying the Rasch Model: Fundamental Measurement in the by Trevor G. Bond, Christine M. Fox PDF

By Trevor G. Bond, Christine M. Fox

Trevor Bond has labored with major Rasch theoreticians for greater than 15 years, advising developmentalists and lecturers on the way to behavior and interpret Rasch analyses in their personal info. The objectives of this authored quantity are: to give an obtainable evaluate of the elemental houses and ideas of Rasch research, that doesn't require a worldly statistical history; to illustrate how Rasch research could be utilized to regular difficulties encountered by way of psychologists and educators; and to arrange readers for appearing their very own analyses and examining the implications. This e-book is perfect for researchers within the human sciences drawn to studying how you can enforce the Rasch version with their very own facts.

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Additional resources for Applying the Rasch Model: Fundamental Measurement in the Human Sciences

Example text

The Rasch model incorporates a theoretical idealization (or construct, or fiction) of the data's interrelations, an unachievable state that is mathematically represented as the ideal straight line shown in Fig. 1.

One of the cover stories in the June 2000 issue of Discover. magazine reports, in layperson's terms, the difficulties that currently beset those who maintain watch over the world's time. Although the passage of time was previously marked by sunrise and sunset, and more recently by pendulum clocks, which also are calibrated against the rotation of the earth, inconsistencies in our planet's shape and movement make it unreliable as a basis for the measurement of time. From 1967, the standard definition of the period of 1 second moved to the atomic scale based on the radiation of the cesium 133 atom.

Items, L, M, N) do not lie precisely along the theoretical straight line. We might get some of our items/observations close to perfect, but our aim is to place them close enough to the theoretical straight line to be good practical indicators of the hypothetical path from A to Z. Suppose we are developing a test of fundamental math skills. Items such as L, M, and N (easy items) might be simple addition problems, whereas items T and U (difficult items) might be long-division problems. Stepping-stone items that are not close enough to the centerline to be part of this path, such as items V and W in our drawn example, most likely do not follow this pattern.

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