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Correction
Author(s) -
Korn Edward L.,
Albert Paul S.,
McShane Lisa M.
Publication year - 2008
Publication title -
statistics in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.996
H-Index - 183
eISSN - 1097-0258
pISSN - 0277-6715
DOI - 10.1002/sim.3096
Subject(s) - lambda , combinatorics , section (typography) , beta (programming language) , statistics , population , physics , mathematics , medicine , computer science , environmental health , optics , programming language , operating system
‘Assessing surrogates as trial endpoints using mixed models’, by Edward L. Korn, Paul S. Albert and Lisa M. McShane ( Statistics in Medicine 2005; 24 :163–182). On page 167, the formulas for R   trial 2and its population quantity are given by $R_{\rm trial}^{2}=(2\hat{\beta}^{2}\hat{\lambda}^{2})/(2\hat{\beta}^{2}\hat{\lambda}^{2}+\hat{\gamma}{2}) \,{\rm and} \,(2 {\beta}^{2} {\lambda}^{2})/(2 {\beta}^{2} {\lambda}^{2}+{\gamma}^{2}),$ respectively. However, since the variance of g   ij ( D )is 2γ 2 , the correct formulas are $R_{\rm trial}^{2}=(2\hat{\beta}^{2}\hat{\lambda}^{2})/(2\hat{\beta}^{2}\hat{\lambda}^{2}+2 \hat{\gamma}{2}) \,{\rm and} \,(2 {\beta}^{2} {\lambda}^{2})/(2 {\beta}^{2} {\lambda}^{2}+2 {\gamma}^{2}),$ respectively. The only place these formulas are used in the paper is in the example in Section 3; for that example $\hat {\gamma}^2=0$ , so that the results are unaffected.

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