[R] (no answer)

Gabor Grothendieck ggrothendieck at gmail.com
Sat Apr 1 16:45:20 CEST 2006

Oh, and I forgot to add.  Please generate some test data for me since
I can't possibly take time out to provide such in order to clarify the
question.  By the way, I did try out R a bit but it did not work and its
too much effort to provide the R code I have or to reduce it to a small
self contained reproducible example to illustrate the salient point.

I am thanking you in advance since I will probably be too busy
to acknowledge the help or to summarize the answers for the
benefit of others and the list archives.  Its not that I don't want to
but I probably won't follow up on your answers anyways if they involve reading
and thinking about help pages, the manual, the FAQ, the posting guide,
statistics, mathematics, programming or other material.

By the way, please email me directly since I normally don't read
the list.


On 4/1/06, Frank E Harrell Jr <f.harrell at vanderbilt.edu> wrote:
> I have never taken a statistics class nor read a statistics text, but
> I am in dire need of help with a trivial data analysis problem for
> which I need to write a report in two hours.  I have spent 10,000
> hours of study in my field of expertise (high frequency noise-making
> plant biology) but I've always thought that statistics is something
> that can be mastered on short notice.
> Briefly, I have an experiment in which a response variable is
> repeatedly measured at 1-day intervals, except that after a plant
> becomes sick, it is measured every three days.  We forgot to randomize
> on one of the important variables (soil pH) and we forgot to measure
> the soil pH.  Plants that begin to respond to treatment are harvested
> and eaten (deep fried if they don't look so good), but we want to make
> an inference about long-term responses.  In addition, we forgot to
> measure the response on some of the days before the plant was
> terminated.  Some baseline variables were not measured for some
> plants, when some of the other variables looked OK.  The response
> variable is only known to exceed a certain value in some cases, and in
> others is only known to be less than a certain value.  The response
> variable also has a great number of ties at zero, and has extreme high
> outliers.  The variability of responses seems to depend on whether
> there was missing variables for the plant.  And halfway through the
> experiment we changed instrumentation and personnel.  All of these
> problems seem trivial when compared to what I have to deal with every
> day in measuring plant sounds, so I hope that someone can help me as
> soon as possible.  I would appreciate receiving a few paragraphs of
> description of the analysis that I can include in my report, and I
> would like to receive R code to analyze the data no matter which
> variables I collect.  I do value your time, so you will get my
> everlasting thanks.
> Note that I will be out of the office from 1:15pm to 1:25pm today.
> This information should be valuable to many.
> I. Ben Fuld
> Technical University of Plant Kinetics
> Slapout, Alabama
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