Like this?

x<-1:100
y<-runif(100)

df<-data.frame(cbind(x,y))
mycoef.list<-NULL
for (i in 10:65)
 {
 mycoef<-coef(lm(y~x, data=subset(df, x %in% 1:i)))[2]
 mycoef.list <-c(mycoef.list, mycoef)
 }
hist(mycoef.list)

regards

milton
brazil=toronto

On Mon, Jun 29, 2009 at 2:50 PM, Hongwei Dong <pdxdong@gmail.com> wrote:

> Hi, I'm using R to do a time series analysis. In the model, I use the lags
> of some variables. such the lags of the variables have different length, I
> just can't use them directly in the lm function. Intuitively, I feel that
> "subset" might be useful, but I do not know how to use it. Anyone can give
> me an example syntax? Thanks.
>  Harry
>
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>
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> PLEASE do read the posting guide
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> and provide commented, minimal, self-contained, reproducible code.
>

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