Approximate expressions for parameter estimates in the Rasch model
作者:
Leslie Cohen,
期刊:
British Journal of Mathematical and Statistical Psychology
(WILEY Available online 1979)
卷期:
Volume 32,
issue 1
页码: 113-120
ISSN:0007-1102
年代: 1979
DOI:10.1111/j.2044-8317.1979.tb00756.x
出版商: Blackwell Publishing Ltd
数据来源: WILEY
摘要:
The Wright‐Panchapakesan (1969) maximum‐likelihood equations for estimating the ability and difficulty parameters in the Rasch model have hitherto required an iterative procedure for their solution. In this paper the equations are solved approximately and simple closed forms are established which give values close enough for most practical purposes to those obtained by iteration. The results are illustrated with reference to a 50‐item physics
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