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本帖最后由 牧童 于 2009-12-24 17:07 編輯
遇到難題了,求大俠們出手幫助一下哦
although there is a ‘trade-off’ as the covariance matrices among random effects proportional to identity matrices generate fewer links between random effects levels
原文全段如下
CU=R (14)
Whilst the part of the coeffcient matrix C arising from the covariances among random effects is sparser than in the corresponding MME for (1), it has to be borne in mind that Z *and W* can be considerably denser than matrices Z and W, although there is a ‘trade-off’ as the covariance matrices among random effects proportional to identity matrices generate fewer links between random effects levels. Hence computational savings in manipulating the MME arise mainly from the reduction in the number of equations when mA< kA or mR< kR.
(牧童注:1.公式中的每個(gè)字母都代表一個(gè)矩陣或向量。2.文字在原文中是一個(gè)自然段,上下行都是另起一行的.3這段與原文無任何差異,我已經(jīng)仔細(xì)校對(duì))。
原文出處:Genet. Sel. Evol. 37 (2005) 1–30
1c INRA, EDP Sciences, 2004
DOI: 10.1051/gse:2004034
Original article
原標(biāo)題
Restricted maximum likelihood estimation of genetic
principal components and smoothed covariance matrices
需要原文的,還是把電子信箱給我吧,
在這里下載要50個(gè)論壇幣啊,嘿嘿,
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