[R] Can I use lm() to fit more than one response and more than one variables in single expression

[Uwe Ligges]

On 13.10.2011 15:50, guoshicheng2005 wrote:
>   Dear All,
> Can I use lm() to fit more than one response in
>   single expression. e.g data is a matrix of these
> variables
> R1 R2 R3  X1 X2 X3
> 1 2 1 1 2 3
>
>   Now i wnat to fit
> R1~X1
> R2~X2
> R3~X3
>
> in turn, and I don't want to do it use loops
>
> of couse it it easy to make it using loops,but the proceed  is very slow since the data is very big
>
> Can't anybody give me some tips or help, my eamil: guoshicheng2005 at yeah.net


No. You will have to iterate in some way. How big can the data be that 
this is slow? Anyway, since there may be overhead by calling it via the 
formula interface,. you can directly fit using an explicitly given 
Design matrix in lm.fit().

Best,
Uwe Ligges




>
>
> 2011-10-13
>
>
>
> Best wishes
> Yours Alxe
>
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> School of Life Sciences, Fudan University
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