[R] PBIB datataset

Kjetil Brinchmann Halvorsen kjetil at acelerate.com
Tue Dec 21 21:53:37 CET 2004

(Ted Harding) wrote:

>On 20-Dec-04 Douglas Bates wrote:
>>This is a new version of SASmixed that was uploaded a couple of days 
>>ago.  I changed it so that the fits are done with the lme4 version of 
>>lme.  It should be faster and more reliable than the version of lme in 
>>the nlme package.
>>This version of SASmixed has a vignette that provides comparative 
>>analyses in lme for the examples in "SAS System for Mixed Models".  The
>>specification of models in the new lme is occasionally different from 
>>the older specification.  Don't pay too much attention to the textual 
>>descriptions - look at the examples in the appendices.  I haven't 
>>finished rewriting the textual description from an old, old version.
>>Those who (like me) cringe at the way that models with crossed random 
>>effects needed to be specified in the old lme may find it interesting 
>>that the Demand example now specifies the model fit as
>>Demand> fm1Demand <- lme(log(d) ~ log(y) + log(rd) + log(rt) +
>>     log(rs), data = Demand, random = list(State = ~1, Year = ~1))
>>The lme4 and nlme packages should not be loaded simultaneously.
>>Use one or the other but not both.
>Thanks a lot for these clarifications. This still leaves me with
>a question or two.
>Suppose I want (as I do) to work through Pinheiro & Bates, example
>by example. Some datasets are here (lme4), others there (SASmixed,
>nlme), etc.
>Does this mean I need to start afresh, loading just the package
>with the dataset currently of interest?
I think it is enough to do
<much work>
Is that right?


>I'm a touch confused about the distribution (a) of datasets,
>(b) of the R functions needed to analyse them according to
>Pinheiro & Bates, over the packages! If I load the package
>containing dataset A, will it include the functions used in
>P&B for that dataset? Or might I need to load another one
>as well? and, if so, might I encounter the sort of clash
>you hint at above?
>(I know I could probably check it in detail in each case as
>it arises, but I guess you know your way arond all this better
>than someone who hasn't been there yet).
>With thanks (and congratulations on what looks like a very
>well conceived book on the topic),
>E-Mail: (Ted Harding) <Ted.Harding at nessie.mcc.ac.uk>
>Fax-to-email: +44 (0)870 094 0861  [NB: New number!]
>Date: 20-Dec-04                                       Time: 21:29:07
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Kjetil Halvorsen.

Peace is the most effective weapon of mass construction.
               --  Mahdi Elmandjra

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