I too have found the Bate's book draft helpful, but I have not been able to
get the lme4a package installed. The best description I have found to do so
is:
http://kmyu.wordpress.com/2010/12/04/installing-lme4a-in-r-mac-osx-10-6-4/

I'm understanding that the lme4a package is dependent on a number of
packages: RcppArmadillo, minqa and MatrixModels (available on CRAN
respositories) and Rcpp version 0.8.8.1 or later (which is not; version
0.8.6 is). Apparently it is available on something called an SVN
respository. Im getting into language I am unfamiliar with. If you can
provide some advice to aid my ignorance in installing this package I could
likely get a lot more out of the book draft.

Thank for you time and assistance.

On Tue, Feb 1, 2011 at 6:34 PM, George Wang <pseudotelphusa@gmail.com>wrote:

> I am also quite new to lme4 myself, so I'll just add one thing to Toby's
> earlier answer.
>
> On Tue, Feb 1, 2011 at 5:14 PM, Colin Wahl <biowahl@gmail.com> wrote:
>
>> Dear r-sig-mixed-models List,
>>
>> [snip]
>
>
>
>> Secondarily: I have read a few times that "wshed/stream" is
>> interchangeable
>> with  "wshed:stream" which is a meaningless interaction. Also I've seen
>> that
>> random effects are specified as (a|b) where a is a covariate and b is a
>> grouping factor. Does having 1 as a covariate simply specifying an
>> intercept
>> of 1? What is the purpose of placing a factor in the place of 1 as a
>> covariate? OR is there a nice complete summary tutorial that I've missed.
>>
> A specification of (1|b) means that the model is fit with a random effect
> for each level of b (simple scalar random effect). The "a" in (a|b) is a
> correlated random effect along with "b", with both an intercept and slope.
> You can also make them uncorrelated, with slope only for a.
>
> The draft of Prof. Doug Bate's book covers many useful basics on lmer, and
> is where I learned most of mine.
> http://lme4.r-forge.r-project.org/book/
>
>


> HTH
> George
>
>
>>
>> I'm looking forward to hearing any comments.
>>
>> Thank you,
>> --
>> Colin Wahl
>> Department of Biology
>> Western Washington University
>> Bellingham, WA 98225
>> ph: 360-391-9881
>>
>>        [[alternative HTML version deleted]]
>>
>>
>> _______________________________________________
>> R-sig-mixed-models@r-project.org mailing list
>> https://stat.ethz.ch/mailman/listinfo/r-sig-mixed-models
>>
>>
>

	[[alternative HTML version deleted]]


