请教：关于SAS中GLM程序的使用

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请教下面一段话的具体含义：

 genotype and field data from multiple environments was conducted using the procedure GLM from the SAS software (SAS Institute 1999). In each environment, the field data of all replications were averaged by the least square means option in SAS. The model used to detect QTLs included the effects marker genotype (M), environment (E) and M  E interaction. Under the assumption of a mixed model with the marker as a fixed effect and the environment as a random effect, the mean square of M  E was used as the error term for the computation of the Fstatistic for a marker main effect. The mean square of the residual variance was used as the error term for the computation of the Fstatistic for a M  E effect.

这里的the least square means 如何计算? fixed effect 和random effect 具体含义是什么？如果用GLM运行此程序的话，该如何编写？

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[此贴子已经被作者于2008-12-16 9:53:11编辑过]

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关键词：fixed effect replications Environments environment Computation 程序 SAS GLM

这里的the least square means 如何计算? fixed effect 和random effect 具体含义是什么？如果用GLM运行此程序的话，该如何编写？

fixed effect固定效应，random effect 随机效应；

proc g/m data sp；  class a b block；  model y =a b a*b block a*block;
  test h= a e--a*block；

在此，随机效应为a*block;a b a*b block 为fixed effect固定效应；

我最近也需要用这个，希望有高手能指点哈！