R help - Feb 2007 - str() to extract components

Hi,

I have been dabbling with str() to extract values from outputs such as
lmer etc and have found it very helpful sometimes.

but only seem to manage to extract the values when the output is one
simple table, any more complicated and I'm stumped :-(

take this example of the extracted coeficients from a lmer analysis...

using str(coef(lmer(resp3~b$age+b$size+b$pcfat+(1|sex), data=b))) yields

Formal class 'lmer.coef' [package "Matrix"] with 3 slots
  ..@ .Data :List of 1
  .. ..$ :`data.frame': 2 obs. of  4 variables:
  .. .. ..$ (Intercept): num [1:2] 1.07 1.13
  .. .. ..$ b$age      : num [1:2] 0.00702 0.00702
  .. .. ..$ b$size     : num [1:2] 0.0343 0.0343
  .. .. ..$ b$pcfat    : num [1:2] 0.0451 0.0451
  ..@ varFac: list()
  ..@ stdErr: num(0)

how do I "get inside" the first table to get the value 1.07 for
instance?

Any help much appreciated.


Simon Pickett
PhD student
Centre For Ecology and Conservation
Tremough Campus
University of Exeter in Cornwall
TR109EZ
Tel 01326371852

On Tue, Feb 27, 2007 at 03:52:54PM -0000, Simon Pickett
wrote:
> Hi,
> 
> I have been dabbling with str() to extract values from outputs such as
> lmer etc and have found it very helpful sometimes.
> 
> but only seem to manage to extract the values when the output is one
> simple table, any more complicated and I'm stumped :-(
> 
> take this example of the extracted coeficients from a lmer analysis...
> 
> using str(coef(lmer(resp3~b$age+b$size+b$pcfat+(1|sex), data=b))) yields
> 
> Formal class 'lmer.coef' [package "Matrix"] with 3 slots
>   ..@ .Data :List of 1
>   .. ..$ :`data.frame': 2 obs. of  4 variables:
>   .. .. ..$ (Intercept): num [1:2] 1.07 1.13
>   .. .. ..$ b$age      : num [1:2] 0.00702 0.00702
>   .. .. ..$ b$size     : num [1:2] 0.0343 0.0343
>   .. .. ..$ b$pcfat    : num [1:2] 0.0451 0.0451
>   ..@ varFac: list()
>   ..@ stdErr: num(0)
> 
> how do I "get inside" the first table to get the value 1.07 for
instance?
> 
> Any help much appreciated.
> 
may `unlist' would be enough?

mod <- lmer(resp3~b$age+b$size+b$pcfat+(1|sex), data=b)
coef(mod)[1]$Subject[1,1]


r-help-bounces at stat.math.ethz.ch wrote on 27/02/2007 16:52:54:
> Hi,
>
> I have been dabbling with str() to extract values from outputs such as
> lmer etc and have found it very helpful sometimes.
>
> but only seem to manage to extract the values when the output is one
> simple table, any more complicated and I'm stumped :-(
>
> take this example of the extracted coeficients from a lmer analysis...
>
> using str(coef(lmer(resp3~b$age+b$size+b$pcfat+(1|sex), data=b))) yields
>
> Formal class 'lmer.coef' [package "Matrix"] with 3 slots
>   ..@ .Data :List of 1
>   .. ..$ :`data.frame': 2 obs. of  4 variables:
>   .. .. ..$ (Intercept): num [1:2] 1.07 1.13
>   .. .. ..$ b$age      : num [1:2] 0.00702 0.00702
>   .. .. ..$ b$size     : num [1:2] 0.0343 0.0343
>   .. .. ..$ b$pcfat    : num [1:2] 0.0451 0.0451
>   ..@ varFac: list()
>   ..@ stdErr: num(0)
>
> how do I "get inside" the first table to get the value 1.07 for
instance?
>
> Any help much appreciated.
>
>
> Simon Pickett
> PhD student
> Centre For Ecology and Conservation
> Tremough Campus
> University of Exeter in Cornwall
> TR109EZ
> Tel 01326371852
>
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