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
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