[R] linear model in the repeated data type~

From: Manli Yan <manliyanrhelp_at_gmail.com>
Date: Tue, 03 Jun 2008 22:06:41 -0600

  here is the data:


table1<-data.frame(y,id,t)//longitudinal data

what I want to do is to use the linear model for each id ,then get the estimate value,like:


but ,you can see the variable "id" is quite irregular,they are not arranaged in order and many number missing,if I write a loop by using "for",it will give me a lot "NA",
and for sure ,I dont want to type id=## for about 500 times,any one know how to deal with it?

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