Testing for centre effects in multi-cent
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Per Kragh Andersen; John P. Klein; Mei-Jie Zhang
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Article
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1999
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John Wiley and Sons
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English
โ 115 KB
๐ 3 views
The problem of testing for a centre e!ect in multi-centre studies following a proportional hazards regression analysis is considered. Two approaches to the problem can be used. One "ts a proportional hazards model with a "xed covariate included for each centre (except one). The need for a centre spe