Abstract
The Rasch model is described as fundamental to objective measurement and this chapter examines key issues of conceptualising variable, especially in education. The notion of inventing units for objective measurement is discussed, and its importance in developmental assessment is highlighted.
| Original language | English |
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| Title of host publication | Applied Rasch Measurement: A book of exemplars, papers in honour of John P. Keeves |
| Publication status | Published - 2005 |