GLM程序问答

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做广义线性模型时，logistic回归，其中offset是什么意思啊？例如：

   off <-  rep(log(sum(dat$yy)/n1.all) - log(sum(1-dat$yy)/n0.all),
length(dat[,1]))
   if (model==1) mod1 <- glm(yy ~ gg.m*gg.f, binomial, dat.all[[1]],
offset=off )

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关键词：程序问答 logistic回归 logistic logisti ogistic 程序

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英文说明是这样的——This can be used to specify an a priori known component to be included in the linear predictor during fitting. This should be NULL or a numeric vector of length equal to the number of cases.
One or more offset terms can be included in the formula instead or as well, and if more than one is specified their sum is used.