Allen,
I would suggest reading about the str() function. It's great for getting
"inside" model outputs and seeing how they are constructed so you can
extract all the specific calculations you want.
Its a bit fiddly to get used to but there are plenty of examples on this
forum.
Hope this helps.
Simon.
----- Original Message -----
From: "AllenL" <allen.laroc...@gmail.com>
To: <r-help@r-project.org>
Sent: Tuesday, January 06, 2009 7:47 PM
Subject: Re: [R] Two Noobie questions
Thanks for your help!
I combined the above two to get the following, which seems to work (if
somewhat inelegant):
int.List<-unlist(lapply(lmList, function(x) {coef(x)[1]}),use.names=FALSE)
lmList is my list of lm objects.
-Allen
David Winsemius wrote:
On Jan 6, 2009, at 1:50 PM, AllenL wrote:
1. I have a list of lm (linear model) objects. Is it possible to
select,
through subscripts, a particular element (say, the intercept) from
all the
models? I've tried something like this:
?coef
if your list of models is ml, then perhaps something like this
partially tested idea:
lapply(ml, function(x) coef(x)[1] )
This is what I get using that formulation an available logistic model:
> coef(lr.TC_HDL_BMI)[1]
Intercept
-6.132448
List[[1:length(list)]][1]
All members of the list are similar. My goal is to have a list of the
intercepts and lists of other estimated parameters. Is it better to
convert
to a matrix? How to do this?
2. Connected to this, how do I convert from a list back to a vector?
This
problem arose from using "split" to split a vector by a factor, then
selecting a subset of this (ie. length>10), leaving me with subset
list of
my original. Unsplit(newList, factor) doesn't work, presumably due
to my
removal of some values. Thoughts?
?unlist
> ll <- list(1,2,3,4)
> ll
[[1]]
[1] 1
[[2]]
[1] 2
[[3]]
[1] 3
[[4]]
[1] 4
> unlist(ll)
[1] 1 2 3 4
> str(unlist(ll))
num [1:4] 1 2 3 4
> is.vector(unlist(ll))
[1] TRUE
--
David Winsemius
Thanks!
-Allen
--
View this message in context:
http://www.nabble.com/Two-Noobie-questions-tp21316554p21316554.html
Sent from the R help mailing list archive at Nabble.com.
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
--
View this message in context:
http://www.nabble.com/Two-Noobie-questions-tp21316554p21317630.html
Sent from the R help mailing list archive at Nabble.com.
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
