[R] individual intercept and slope

[Phil Spector]

You didn't say what form you wanted the output in, but 
here's one way:

> sapply(split(dat,dat$individual),function(s)lm(height~time,data=s)$coef)
                    1         2
(Intercept) 8.466667 19.866667
time        2.485714 -2.057143

 					- Phil Spector
 					 Statistical Computing Facility
 					 Department of Statistics
 					 UC Berkeley
 					 spector at stat.berkeley.edu


On Tue, 2 Nov 2010, Rosario Garcia Gil wrote:

> Hello
>
> I would like to extract the estimates for the intercept and slope by individual for growth from a lm fit.
> Any advice?
>
> Individual Time point      Height
> 1			1           10
> 1			2		11
> 1			3		23
> 1			4		15
> 1			5		21
> 1			6		23
> 2			1		24
> 2			2		12
> 2			3		9
> 2			4		10
> 2			5		11
> 2			6		10
> ...
>
> Thanks
>
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