[R] linear model with the repeated data type~

From: Manli Yan <manliyanrhelp_at_gmail.com>
Date: Wed, 04 Jun 2008 15:20:39 -0600

here is the data:


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

the above is only part of 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 so,how to get all the esimates for each id,and exclude the NA,then record those estimate in one table?

great thanks ~~

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